You know how OBD2 works but want no part of it? You have an Ect, Iat, Tps, Map/Maf, Iac, O2 sensor, Cps/cam sensor and your injectors.
With the exception of 'random cylinder misfire' and 'cylinder lean' (vac leak) codes everything else pretty much tells you what is going on with the car. With non EFI vehicles you have to manually re-curve the distributor change timing, adjust jetting and honestly 'guess' it all into being 'right' not saying I can't do it, I have 3 modified carbed cars in my drive way (a galaxie, 1st gen camaro and 67 barracuda) just saying for overall driveability, economy and POWER a self tuning EFI is the easiest choice.