the small booster is what it would have with a B or RB enegine with stock late mid 70s smogger VC (not the HP tall penthouse VC)
still tight on R&R of VC.
on the mid 80s trucks you can go to the 86 3/4 ton vac booster which is a small one that has the alum 2 bolt MC.
it has been 'said' that you can hammer on the bigger pancake booster to get it to fit a BB in there... but that always looks like a chebby goober with a BFH has worked on dodge.
