I have a new 350 chevy engine in a 84 chevy pickup. I HAVE A POP OUT OF EXHAUST WHEN I RAP ENGINE UP. WITH A TIMING LIGHT ON IT THE MARK ON THE BAL. WONT COME CLOSE TO TIMING POINTER. I DROPPED DIST. IN AND OUT ABOUT A DOZEN TIMES IT DOES NOT HELP.I EVEN INSTALLED A NEW TIMING SET IN THINKING...