340 Static Compression Numbers and Test Procedure

race gas, propane, e-85 could all work without pulling the engine
if you look in the spark plug hole with a bore scope and see domes post back
btw what rockers? if rollers can you see the ratio
and you can measure valve lift without dissambly
he who posted that the cam may be too advanced could be right
something you can fix by pulling the timing cover
back off on the timing till you get it sorted out
yellow rose may be the most experienced help