Thanks for the comments everyone. Now here's some more info...
No, I have never set the timing but the truck runs beautifully after it's warmed up and not backfiring.
Have no way to know the RPM's at idle but it's not very high.
No, I have not done anything to the carb. This problem is an ongoing one since I've owned the truck 2 yrs.
I installed a new hose from carb to wiper motor when I bought it. I assume there are no holes and connections are good.
Engine is a 1950 216 CID.
Thanks guys,
Spot
