QUOTE(trent1542 @ Jul 11 2011, 06:45 PM)
thanks guys... I think I will stick with my /4 unless I can get my hands on a 911 2.2, preferably a 60s or 70s unit
2,2's existed in '70 and '71 only. T's had carburetors, E and S were MFI. For a variety of reasons, MFI is great for performance, fairly sucky for economy.
I would not go earlier than a 2,2 unless you're looking at specific class rules.
I would not go earlier than 3,0 (1983 911 SC) unless you have a _really_ good reason.
3,2 and newer is definitely the hot setup, especially if you're looking for economy and simplicity. There are original 2,0's - or engines rebuilt like original 2,0's - but they're done for specific reasons. It's just as expensive to rebuiild a 2,0 as a 3,2 - maybe more, because of the availability of parts for the later engines.