Although the Holley system is easier to install, I have been told more than once, unless you get the expensive digital one, a factory GM setup is the way to go. I have done a bit of research on the subject so ill pass on a few bits of useful info.
First, you need to have an electric pump. One way is to get the tank from an '87 truck because that is the only direct replacement for your '84. However, in the late 80's or early 90's fuel injected ford trucks used an electrical fuel pump that was on the frame. I would use one of these (dont tell anybody you used a ford part though!!!). The early TBI's dont require much pressure, what ever year pump you get, I would make sure it is for a ford TBI system.
Take your time with the harness You shouldnt have to cut anything. There is a vehicle speed sensor on an '87 truck that I doubt your '84 has. it is located behind the insturment cluster. You may have to get the '87 wiring harness and insturments too. Im not sure about this, my truck was origionaly equiped with a 4.3 TBI so i dont have to change anything.
Also, all of the parts from the 4.3 are the same as the 350. The only difference is the distribuitor, injectors, ECM, and ESC.
There is a way to wire around the EGR and AIR system too, I dont remember exactly how, I do remember it is very easy. If I find my notes ill post back.
Mike
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