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Any progress?

Are you absolutely positive you hve the ignition wires hooked up correctly and not in the proper sequence?

M37s have a timing chain and any vehicle with a timing chain can skip a tooth if the chain or sprockets are worn. I have had this happen on two different vehicles. It's easy enough to check and eliminates one possibility. You said you had spark, so that eliminates everything in the ignition...

Start with the basics. 1. Confirm correct valve timing 2. Confirm correct ignition timing 3. Spray starter fluid or gasoline into throat of carburetor while cranking If 1 - 2 are correct, the engine will run if it has fuel. If it runs after #3, you have a fuel problem. Then confirm that...