95 c1500 tbi 4.3 and 4l60e swap to 75 carb 350 and turbo 350

[Omana2015]

I have a 95 c1500 with a 4.3 tbi vortec and I plan on swapping out the engine and trans with a 5.7 carb 350 and turbo 350 trans that came out of a 75 3/4 ton truck I bought both about a week a go i have every wire and that with the engine on it but the guy cut it at the wiring harness so I have wires just not a harness and thew away the ECM is there anyone that could help with suggestion of what I should do?
Pic of the 4.3