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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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