Have a CPP PB kit in my '61 C20. Pulling vacuum off the head (stock 235), and it's pretty weak at idle--as in easing up to a stop light. Noticed elec vacuum pumps in several catalogs to help maintain pressure for people running cams in their SBC's. Milling the head for more compression not in the budget right now, plus the old girl starts every time. Thoughts from the brain trust? Ray in Va Beach