I was wondering if any could tell me what all i would need for a swap from the lil iron duke up to a 4.3, i wanna step up my speed, plus its just time for a rebuilt on the duke or something since i cant get passed 80 and it sucks on the fuel..lol.. but the main thing i need is the motor, outside harness, motor mounts, computer, and radiator. will i need the inside harness for the computer to work right? i know i also need a 90` trans and was wondering if i got one from an older 1500 series pickup with a 350 would it work, or would i have to find one for the s-10/s-15, and would the flywheel from the 350 bolt right up for the 4.3 or would i have to buy a MT flywheel? also does the computer matter if its an AT or MT computer or did they not have that yet with the TBI 4.3? also could i install a vortec 4.3 and would it be alot harder to? as for the driveshaft would my stock one fit or would i need to find one from either a 4.3 s10 or possibly the 1500 series truck? my truck is 89 s-15 with a 2.5, 5 speed, shortbed. I know Im probably asking stupid questions to you guys, but i wanted to make sure on the stuff before i went and did everything and something not work right and be pissed cuz i didnt know whats wrong. im not into the 350 because if i drop that in i will end up locked up for racing..lol.. so if you could tell me about what i need i would be very appreciative, because i wanna try to make this a once shot install so i can be on the road with in a few days.