yeah
www.corral.net is a good site...EFI was 86+, 87+ had the HO intake and heads, stock weight on a notchback 5 spd is...way lighter than a 3rd gen
89+ has mass air, 87-88 is speed density(easy to convert though) i think 87-92 has forged internals, 93+ has hyperpneumatic pistons (not a big deal unless youre looking at boost or nitrous)....anything else you can ask me or go to corral