Ok so I’m helping my dad get the timing right. The engine is a 1970 440 with the six pack set up on it. Engine seems all factory. What should the balancer be set at? Then what should the timing gun be set at? I need like any info I can get to get this set right. There pop noises coming out of the exhaust and seems like it’s due to timing issues because we changed the center carb with a rebuilt one and popping for worse