If it is popping back when trying to start, it could be the ignition timing is wrong (180* out), wired wrong in the distributor cap, carbon tracked cap, or moisture in the cap. Try pulling the coil wire, give it a crank. If the popping stops, there is likely an ignition problem.
Are you familiar with how to get #1 at top center on compression stroke? If not we can explain.
Another problem that can cause blowing back is an exhaust valve not opening, as in a bent pushrod or flat cam, or an intake stuck open or not sealing.
One more cause, not real common, but a restricted exhaust will cause blow back.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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