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Your engine may simply need to breathe more. One of those cheap screen vent caps, try one on the opposing valve cover from the PCV valve, or use one in place of that valve which may be better.
Make sure that place on the carb that the pcv vents too has suction as someone may have messed with it.
Please note, I have never worked on one of these. Mostly Fords from 1950-92 and some pre-fuel injection Chevys.
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