Toof,
You will always have some popping, if you're trying to eliminate all of it, you probably never will be able to.
Even with stock setups you get it, but it's so muffled by the pipes you can't hear it.
If it's a lot of popping and loud, you have an air leak somewhere, look there and stop dicking with the carbs.
Check vacuum caps (they get minute cracks on the tops, check with a flashlight and a magnifying glass if need be), the little hose that goes from one carb to the other, the rubber boots on the manifolds, be sure they are tight, check that your crossover and pipes are snugged down, the headers get loose and will cause popping, tighten everything down, check again.
If you are running the 45 pilots there should be virtually no popping being caused by the carb adjustments.
It's probably something else if you have eliminated everything else.
Maybe so, maybe not, just check for them leaks.
