Here is the latest, replaced plug wires and plugs, gapped to 35, also changed fuel filter and rebuilt center carb, Still starts great and idles fine, but as before you take it out for a drive and when car warms up and you get on it!! low and behold, starts popping again let off and it runs fine, put 68 jets in and a 5.5 pv. like i said up until the other day everything was great then like mentioned driving normal to the car show and started popping and now i'm at the end of my knowledge.