if it's obd2 motor in obd2 car get a obd2-1 conversion harness ("a" if it's 96-98, "b" if it's 99-00) and a socketed/chipped ecu w/ tuning. or get an obd2 p13.

if the motor is obd1 then the crank pos sensor and dist is different than the obd2 if i remember correctly and it'll throw codes. if his f-series isn't throwing codes for that then it's probably an obd2 motor.

if you need a socketed/chipped ecu and tuning, let me know.