But if i keep the efi, can i go to a local yard and pick up an 89-93 harness and it will be the same with exceptions to the maf connector and maf pcm? ive never done the swap before and I need to know exactly what I need to convert it. is it best for me to get an exploder intake and plenum? also, which maf should I get? Thanks to anyone who had helped me!
There are some concerns you need ot keep in mind before grabbing engine harnesses. First off, in 1990, the harness interface between the body harness and engine harness changed. So that means any 1990+ engine harness won't work for you.
I beleive 86-88 Speed density harness is the same. I do not know 100% however, so you might want to do a little research here. I'd do it for you, but it took me 4 days just to reply here. 1989 Mass air harness will work too, but it's expensive. Guys want top dollar for these, when a stand along MAF harness is $40. If you plan on running the stock camshaft, you really don't need MAF, but if at some point down the road you want to do the swap, grab a meter, an A9L and the $40 stand-alone harness and it's an easy job.
My opinion, take care of this harness issue first. Swap in an OEM stock speed density harness and get the car running great. The computer will generate codes for faulty sensors and such. EFI is pretty easy to deal with and troubleshoot.
I know you want to do mods to the engine (heads and such), but i would put that on the backburner for now and ger the car running great. Otherwise you'll jus tfrustrate yourself in the long run by doing too much at once. Trust me...i speak from experience. Just tackle one issue at a time