yes im wondering if the airgap 7576 is overkill with the 750 dp holley , or perhaps not enough pcv vacuum to keep blowby under control ,I will try the turn down tube for now , thnx
You should be ok with the stuff you have. I don't believe in overkill...but that's just me.
Ok going to ask a question and I don't want you to take it as offensive, because that's not the way it is. Here goes...
I know this dumbass, and he was fighting PCV issues. He wasn't having all the issues you are, but he was going nuts trying to sort it out.
Turns out the guy had a spider, or some other creature like a wasp or something had built a large family dwelling in the hose from the carb to the PCV valve. Once he blew that out of the hose it was game on and everything went back to normal.
The moral of the story is verify the line from the back of the carb to the PCV is fully open.
I also seen some Holley base plates that get crap and whatnot built up in the groove that feed vacuum to the port. That will definitely put you in a world of poo.