The 914 versus 911 thing is a tough call. I've driven both on the track (914 lots, my 930 once), and as Rob says, they are different platforms. IIRC, most of the guys here that have driven both say that it "feels" easier to drive a 911 at higher speeds than a 914. My opinion is that the 911 is a slightly more robust platform to start with (thicker gauge metal, etc.) and there are more developed racing parts for them.
But....914's are the outlaws...and I like that! Where else can you have a car that is 30 years old and can contend for a TTOD at a PCA auto-x, then go out on the track and be just as quick as 911's. There is something cool about that....
It takes alot of money to make either a 911 or 914 fast or a "contender" if you will. And the other part of the equation is driver ability. Currently, our new car would be pointed to an SCCA/PCA Club Racing equivalent to a GT2 car. Weight and brakes yes....engine size (3.6) yes, but power and driver ability....a big NO!
Our 3.6 dyno'd a little over 300HP at JWE last week. Most GT2 cars have 100HP+ more than that. So again, by the time you put money into the motor to get it there, it's really the same as what you would put in a 911. So it comes down to what you prefer...911 or the outlaw 914.
I had a moment of weakness last week when I saw the 911 race tub...all the fixin's and boom....I'm running....but it wouldn't be the same.
But you just look at the price tag of building a "GT" level car and it opens your eyes to all that you can pick from once you get into the "cubic dollars" approach. The $50K price tag is not far off of what we will have into our car....and I'll still get blown away by any SCCA guy or the PRC.
Example: Our car
----------------------
Tub, Chassis development (raised pickup points), paint = $15K
Motor Development (built for "unlimited" hours..yeah right) =$10K
WEVO 915 with flipped R&P, short ratio, all new internals = $10K
New seats, fire system, harnesses, f/g this and that, trick
this and that, heavy duty motor oil cooling system, heavy
duty trans oil cooling system, tires, wheels = ~$15K
Tag Line "GRIN FACTOR" = Priceless!
Tough call on the platform....There must be a reason that 914's aren't
developed by someone for speed compared to the 911's, probably
because they were stopped being made by the factory in 1976....
I have to admit, the assorted 911 eye candy at JWE every time I go there
is sure intoxicating! I can't wait till my car is over there getting it's
powerplant plugged in...then I can drool over my own car!
Bill P.