It almost has to be the timing chain, if it was only loosing compresion in two cyl. than I would say blown head gasket, cracked head or block. But having
no compresion in more than two cyl. its the timing chain. Get new gears and double roller chain set, gasket for the water pump and timing chain.
My 79 bronco with 400m did the same thing. It killed 3 ignition modules than I replaced the chain and it was fine.
Junior
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