[30 Closed Cab PU]

Perhaps hang a small tank from the radiator support rod and run a line straight into the carb.


If it runs OK then you would know it is fuel supply issue.


If it does not help possible carb, intake, electrical. Since you have replaced the carb with a known good one, that should not be it, most likely not intake. That leaves electrical. Flakey condenser or coil? Wireless distributor plates can cause a lot of odd/unusual issues. Could try bypassing the wireless connection by adding a wire. I realize some of this should have been addressed by replacing the distributor, just a double check.