Wiring/Ecm question

If the only thing for the factory injection missing is the ECU then keeping it injected is going to be the cheaper route. If you are dead set on running a carb then about all you need to get spark is an ignition box and compatible distributor. You can use the existing coil with zero issues. If the stock fuel pump works then you will need a regulator that can take the high pressure down to the 7 psi range for the carb. Something like this would work but its not cheap but then again it works:


You can pull the pump hanger out of the tank and install something like this or modify the stock hanger:


Then you will need a pump, filter, possibly a regulator (some pumps internally regulate but I don't trust them), and possibly a return line back to the tank (good idea so you do not get carb heat soak if you are worried about that), and then there is wiring up the pump and plumbing from the tank to the filter to the pump and to the carb and then back to the tank if you run a return.

You could also run a mechanical fuel pump at the timing chain cover which means new timing chain cover, eccentric for the pump, pump, and figure out what to do with the timing chain cover as the one you have is does not have the provision for a mechanical pump so you will need on from '85 and down as well as that era water pump. Not sure if the mechanical pump will clear the power steering but I think it did on the '85 GT's which were serpentine.

With all of that I would just pursue the injection if it's all there but the ECU.