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Good afternoon, I have a 1970 Buick Skylark, 350 W/ 2bbl Rochester 2GV. The engine has been refreshed,with approx 5,000miles on the engine. Before the refresh, I had a slight popping(thup-thup) out of the tailpipe( duals w/iron manifolds) it is timed correctly, with no issues on vacuum. Have any...