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Upon further review, could I have a problem with my distributor? I ran the engine for about 5 minutes (with the backfires) and noticed that two of my header pipes were cooler than the others? Could those cylinders be firing intermitantly and when they miss that un-burnt fuel is causing my...

Have not done a compression check yet, dont have the equipment for that yet... The backfire is from the exhaust. It even happes while driving, not just idleing. I will check the distrib cap later today.

I have a 57 312 Y block in a 58 F-100 that has a backfiring issue. Once the engine is warmed up it will backfire every 10-20 seconds, some are louder than others. I attributed that to too rich of fuel, so I adjusted the jet ports on the Holley 4 BBL carb, it did not help. I've used my vaccum...