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Normally, spitting out the carb is said to be due to a lean mixture and popping out the exhaust takes place when the mixture is too rich. It is easier to understand the exhaust popping as that takes place when unburned fuel ignites in the exhaust. [ Made worse when there is a leak which...

mine cleared up with a different carb. [I ran hotter plugs too].

I've the exactly the same problem in a jeep racecar with an allis chalmers engine I'm on my 4th carburetor, this one seems much better than the others. little backfiring and more power. 3rd heatrange of plugs. set the valves checked timing cant find it...yet. dennis