So I have a 1991 Chevy Cheyenne step side 2wd with a nv3500 it originally had a 4.3tbi in it it cracked the block so I bought a 1989 5.7tbi out of a suburban my question is what computer do I need to correctly run the 5.7 and the nv3500 the computer that was in the 4.3 is a 4288 awdr and the one out of the 5.7 is a 7747 anlw but I do not have the 5.7computer I did not want to get a computer until I knew which one I would need exactly to run my setup any help or advice would be much appreciated thanks in advance