340 build No POWER need help w tune

just pull the valve covers and check the valve adjustment...then go back to the other problems....sure sounds like one or two of them is too tight...make sure you have an msd compatible coil, good grounds for the box and proper airgap in the dizzy, you need plug wires compatible with msd box also. the cam is part number 20-601-4 hydraulic. find zero lash then add 1/2 turn while the valve covers are off spin the engine and make sure all rockers move, being a new engine/cam wiping a lobe off in a short period of time could happen...good luck let us know what ya find