old guy
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I have not read every thing in this topic. But - are you still using ATF in the pots? I have a 72 bought in 2010 played w/it for years. Got serious and found mine would backfire cause I used too light of an oil in dash pots. I'm now running 20w or 20/50. Lite oil allows the pots to rise too fast and/or too high. Too much air too little suction = backfire. In one of these forums I found a drawing on how to set float height. Set mine and car runs great. (Turn seat down 10 turns and get gas to just appear at top of seat).