Advice Needed - Can't Start Rebuilt 273

pop the valve cover and verify that when damper is on 0 that both valves are closed on number 1 ,rocker up and pushrods loose to where you can spin them with your fingers. if not turn motor 180 and check again. then when this is verified make sure rotor is pointing at number 1 and firing order is 18436572 clockwise.mopar is 1357 drivers bank and 2468 passenger bank.if compression is still that low id check head gasket sealing.