Wiring Questions???

[FB85C10]

Help, lol!

I have a 1985 chevy c10. my question is that under my dash is a hack job in the wiring that the previous owner left me. i started with the computer and traced the wiring out thru the firewall and it was cut off and that harness was removed out of the truck by someone else, do i need to hook up the computer to run my carburated motor? I guess my general question will be what exactly will i need to run this truck with this motor in it minus the obvious? there is no ac.

Thanks!