340 Oil Priming Question First Start

Has this engine ever ran before? Was it just recently overhauled? We've had engines sit for years and we didn't have any trouble getting the system to oil. Was the engine protected from dirt, dust,grime during it's 5 years of not being used? I think that I would release the rockers so that the valve's don't open and spin the engine over with the starter. Turning the crankshaft over by hand maybe to slow. I know that it's been said that doing this could cause camshaft damage and that's why I suggested to loosen the rockers also a heavy grease could be applied to the cam lobes. Nothing else has worked up to this point. If he has 60 lbs of oil pressure, that tells me that the rod and main bearings are getting oil.