The manifold is a edlebrook performer/duel plane. the pcv enters the manifold on the backside of the runner going to the right rear side of the motor. the holley is new and it sits on a 1/2" spacer. the rear plug at the base of the carb is vac and it is pluged into the brake booster. the tube on the rightside of the carb is a vac line for the distributor advance. i have not been able to ck for vac leaks as i'm in the desert in kuwait/army sand warrior. the motor was just put together and i don't want to send it back to the shop because they have not got it right over several attempts/they're done!