Originally Posted by cobalt327
The info from Edelbrock states, in part:
If this wasn't followed, then you cannot expect the cam to work as it was designed to.
That said, there's no reason- even if the engine is bone stock- for it to be backfiring through anything, be it carb or tailpipe.
You are correct Cobalt, Seems i got away from what the OP was saying . And he has either wiped a lobe on the cam already or cross wired,
Or out of time. JMO You think maybe he has the valves out of adjustment?