All Plugs Fouling on Right Bank

It does make it richer or leaner(turning the mixture screws(what the eng sees) but not the air fuel mix that is coming out next to the butterfly is set from the factory, and won't change.......with out mods as you have spoken of.
I consider myself well rehearsed around a holley, but not enough to go drilling out factory setting. not with out someone that knows what the f^&*()) they're doing standing over me as i did it!