I'm wrapping up loose ends on my swap to a Muncie-20 from a PowerGlide. When the car was an auto there was a vacuum line from the top of the intake manifold going to the trans modulator, a second line from the side of the Holley 650 to the PVC valve in the valve cover and a third vacuum line from the front of the carb to the distributor vacuum advance can. Should I just block off the hole on the top of the intake and keep everyhting else the same or do you get better results using the vacuum line on the intake to go to the PVC valve. (I'm not even really sure what the PVC valve does anyway).
Thanks in advance for your help!