Carl - whereas the leaking is noticeable, the leakage is not the real problem associated with the warpage.
If the castings are sufficiently warped to see leakage, then the internal vacuum passage controlling the power valve actuator can suck air, allowing the power valve to always be open. Anyone own stock in Shell Oil?
And if one drives aggressively around corners, fuel can slosh into the vacuum passage on a hard turn, stalling the engine.
I guess if I were truly in love with the Rochester B, I would take a page from Holley's book, and try to obtain some of the super-sticky and expandable gasket material Holley uses on their end-bowl carbs (4150 and 4160), have a die made, and cut B gaskets. But I really don't think its worth the trouble. We sell maybe 7 or 8 B kits annually. Would take 50 years to break even.
Holley bowls warp as badly as the Rochester B. I have three engine fires (two on performance cars I bought new) in less than 9000 miles to prove it. Haven't used an end-bowl Holley since 1973.
Jon.
