That was it! Pulled the vacuum hose and plugged the port on the carb and it runs great and NO popping. Never would have thought le weekends. Changed points and condenser ,plugs gas filter,cap and rotor..checked all pushrod.
Mine is a stock points distributor from 1966. I have a new big block in the works. I run without it at the moment. It doesn't get much use working 6 days a week so it sits..I think that you could replace the canister or distributor.
