Go with a GM TBI system. Find a donor truck and just rip all the parts off it.
You need an in tank fuel pump, filter, lines, TBI unit. Intake manifold or adapter. All the necessary sensors and actuators. Distributor, The wiring harness and ECM.... If you have headers you'll have to weld in an O2 bung. When I ever get some spare time I'll do a write up and convert one of my trucks to TBI. I have a whole system sitting in the box waiting for me.