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73 Duster 360 Have tried 2 different Carburetors and neither one will adjust, can turn screws all the way in one at a time and nothing changes First Carburetor brand new brawler, second one Proform, 650's, double pump, fuel pressure 6lbs 410hp. Need a little help No vacuum leaks

Lots of questions, I'll try to get all the answers I can Newly rebuilt Motor Back fires as soon as I hit the gas Idles great, New Carb. Timing set at idle Has a curve in dist. Maybe a better dist. might help

I've got a 73 Duster, 383 40 over, mild street cam 750 holley,Power valve is good,Plenty of Vaccum, Everytime I get on it , it backfires I just reset timinig for 28 to 36, seems to solve most of the backfires but still has a small one, How much is too much timing, Do I need more timing or...