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 - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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