Originally posted by Stu Cool
I would switch your PCV and Power brake vacuum lines. The PCV should go to the carb and the brake booster to the manifold. You do need a breather on the opposite valve cover. Some factory cars have a breather tube running up to the air cleaner, but they serve the same purpose. If you are sucking air out of the crank case through the PCV, you need to let it in somewhere.

Pat
I agree with switching the pcv and power brake lines Pat but not on the breather. The pvc relieves the pressure created by blowby. If you have a plugged pcv valve on a sbc it will blow out the front or rear intake gasket. That can't happen if you have a breather. The breather would vent the blowby into the atmosphere and that's what the pcv is supposed to eliminate.