I was thinking valve timing might be off. This will result in low compression if the valves open before or after they should. If off too far the pistons will hit the valves, probably.

If it is a fuel fault it should run on a little ether if all else is correct.

It it is advanced or retarded ignition timing it should backfire or try to fire against the compression stroke.

Tom W

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.