Bob,
You will need a pump that provides about 50 psi max. Fi wants pressure not volume whereas a carb likes volume and low pressure. maybe your pump will work, check the specs.
As for wiring, you will need to wire the PCM and provide it with power and sensor inputs. Also you will need the diagnostic port (plug) so that you can edit the computer and pull diagnostic codes. You can probably keep your gauges, just pull the sender units from the old engine. The PCM has an output for the tach, but you can likely use what you have. Check the location of your rear mount on the tranny, the T56 mount is same as the TH400, and the 200 4R. The output splines on the T56 are the same as all GM auto trannies (except the TH400), so if your tranny has the same splines as, say a TH350, then depending on the length of your driveshaft, it may work.
Tim