C20B's were a great machine in it's day- which was about 40 to y50 years ago. Machine was made somewhere between 1960 & 70- ballpark.
Most usual parts are still available- value would be scrap value- maybe $500.00. I'd check the distributor rotor while cranking- the snout of the camshaft can shear off. If the rotor's not turning while cranking, the camshaft is the culprit.
If the cam is broken- pass on the lift. Engine replacement would be your only answer
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