$2K
What are the compression readings?
What is the oil pressure when it is warm and at idle?
What transmission?
What is the serial number on the engine? It is pressed into a ledge in the block, just to the rear of where distributor goes into the block. The block might not have the correct fittings for the front motor mounts.
A 1956 and later 235 will have a higher compression head (and, higher horsepower).
Pre '68 Dave and others should have more useful/helpful comments/questions.
