93 s-10 4.3 in a 86 s-10

[Dennis C.]

Hi I'm new to this site have a couple of question some one may be able to answer here it goes.I'm taking a 2.8 from my 86 s-10 and putting it into a 85 s-10 will I have to change the whole wiring harness from my 86 to the 85 cause the 85 had a 4 cylinder in it? From the 93 to the 86 will I have to take all the wiring harness from the 93 to put the 4.3 in it since the 86 had the 2.8? Am I looking at a really big job or what? What about the computers will they have to be switched too? I hope some one can answer. Thanks Dennis C.