welcome! I had speartech streamline a harness for a swap i did 2 years ago(97 LT1 into a 86 IROC Z camaro) and he did a great job. The 4 wires to hook up if i remember correctly were fuel pump relay, power ground and i think accesory power, but i cant rember. My next harness im going to get will be from NELSON PERFORMANCE, (5.3 into 95 S-10 Zr-2) He knows his stuff and his service is great too.