Al,

Correct, before the breather there was no other air inlet. Just through the carb. And, your right about the rear vacuum outlet. I found the plug at the rear of the Holley. I plan on installing a new port at the back and connecting that to the power brakes, then running the PCV hose to the main large port on the front of the carb. Hopefully that solves the issue. Wondering if I should still put the breather on for additional air in/out and adjust the mixture screws to compensate for the rough idle?