"thats it nothing else??"
which transmission does it have?
high pressure fuel pump for the TBI?
Electric speedo? Evap canister? Air injection for the exhaust and cat?
They are all linked together and the ECM won't work without the TBI in the system. Changing out ALL of the wiring harnesses won't be fun or easy, the electronics are not backwards compatible.
Sorry but I think techinspector1 nailed it, much easier to find an older truck to play with.