I think that all you need is a distributor with mechanical and vacuum advance. Get an electronic one for a 318 so the timing curve is right. Use ported vacuum on the carb for the dist. Junkyard or Summit Racing for what you need.
I don't think the trucks had the electronically controlled carburetors. Check to see if there is a plug on the float bowl (there might be a throttle switch, which does not matter). If it does have the electronic carburetor, then you need to replace it with a conventional one or you will not get any enrichment during hard throttle. The metering rods are controlled by an electromagnet, not vacuum on the electronic carbs. I helped a friend get one of the electronic carbs to pass Kalifornia smog check. Not easy.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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