Here's my 2 cents .....
* I have some mechanical experience....how hard are the cars to work on?Not hard, plus there are a few "experts" on 914s in your area if you want to take it to a shop. One of the reasons which I looked for a 2.0 H4 back in 75 when I got mine, was that I figured that I could always find somebody who worked on aircooled VWs in Podunk wherever with parts & know how to get me to a real Porsche+Audi dealer in a pinch on longer & XC trips, and the 2.0 was engineered by Porsche from the 1.7L, because VW thought the 1.8 was as far as they could get it!
* Are 914's like most cars in that you should buy the best you can afford?Yes - unless you're looking for something to work on & tinker with, restore, etc.
* Other than hell holes, rockers, and floor pans are there any other "gotcha!" places to look for rust?In addition to the suggestions above - remove the steering rack cover & look for rust up under there - esp. at the brackets for the steering cross member, F cowl to fender joints - remove seals & look into joints, trunk floors F & R, remove the seals at the trunks & check channel for rust, remove the outer door seals on the door & look in channel & door bottoms, around the windshield, rear of floor pans below rear window (esp. if the rear window rattles or is loose) F & R door jambs & all nooks-n-crannies therein, around the windshield moulding, at sail mouldings at roll bar (esp. with vinyl/chrome trim), around taillights & rear of R trunk below same, & on 73-76 MYs look behind the engine bay firewall heat/sound pad for rust on the firewall & engine shelf there.
* I know this is subjective; but, is any year just "better" than another?IMHO the 73 2.0 is best, but then I highly prejudiced having owned mine since 75 - the 70-71 (-72 very few) 914-6 is the most rare & preferred by many (3000+ built), and then the 73-74 914/4 2.0L is the next best with nearly the same HP (110 hp stock -6 vs. 95 hp stock 2.0 -4 in USA spec or 100 hp with Euro heads), but better TQ lower in & across the range (you have to wind up the -6 pretty high to get the same TQ). Within that 73-74, there are the 1000+/- 74 LEs that are unique for paint & details, and the early 73 MY 2.0s came "fully loaded" with pretty much all available options included in the Appearance & Performance Group option packages (including the F&R sway bars Pat mentions & the 10# lightweight forged alloy Fuchs "2L" wheels) - & most of the USA 73 MY 2.0s came so equipped. The USA distributors marketed the early 73 MY 2.0's as the "914 S" - although Porsche in Germany didn't buy off on it & made them drop it in early 73. Some of the very early 73 2.0's had the black vinyl on the A-pillar/Windscreen Frame as well for the first 1100 or so VINs (1103 is confirmed), as well as those made in Aug-Sept having a mix of the 72 MY parts, such as chrome interior door handle cup surrounds (instead of black plastic) & chrome window winder base, different air cleaner box top (embossing simplified over time), etc.
* Is a car that still has its original fuel injection better than one that has been converted to carbs?IMHO stock EFI is best for a 914 you're keeping as original &/or for Concours, but if you're looking for a mildly hopped up H4 (e.g.: a Raby 2056 or 2270, etc.), then you'll get more HP with dual carbs, but then you're back to synchronizing carbs that the EFI intended to get around in the first place. A 2056 with stock EFI gets about 115 hp, while carbed can be built to 125 ro 140 hp & more wile more displacement up to 250+ hp in some race motors.
Here are some websites with great info on 914s, in addition to the 914 Info section at the top here, and the Originality & History Forum's various topics:
http://bowlsby.net/914/Classic/(the above also has a PPI check list in its many pages that Jeff has compiled)
http://www.bowlsby.net/914/CanAm/p914.com
Info on early 73 MY -
http://www.914world.com/bbs2/index.php?sho...c=61696&hl=http://www.914world.com/bbs2/index.php?sho...=67816&st=0"914S" Info -
http://www.914world.com/bbs2/index.php?sho...=107851&st=There is an early 73 2.0 with the A-pillar vinyl sorta near you FS now in Columbus GA, that the 26 year owner needs to sell due to moving. It's not perfect & needs some work to get back to original, and needs a good PPI to be sure it's solid, but is priced reasonably from what I can tell (not related nor have I seen/driven it).
It's listed here:
http://www.914world.com/bbs2/index.php?act...20&t=117270Others have also given you a variety of FS links, depending upon your druthers!
PS - in some states some MYs are exempt from smog &/or other certifications, such as CA is exempt for 75 & earlier - so that also may make a difference, in addition to the 75-76 2.0 dropping to 86 hp due to smog eqpt. & they have the big black "rubber" 5 mph impact bumpers (some prefer those).
Good Luck & post lotsa pix of what you get!