If you have to use a Holley 4 epoxy over all the cup plugs on the outside of the metering blocks so they can't back out under boost. Get Nitrophyl floats so they won't crush under boost (won't always happen with the metal floats, but it can). Holley makes boost referenced power valves, what to reccomend for which to use for your application, I have no idea.
However if you want to use a vintage looking 4 barrel carb, that has a history of use in a blow through application think about a Carter, they were used blow through by the factory on Studes with the McCullogh blower. It has been fairly well scienced out by the Stude nuts (I mean that with respect) and has been adapted to blow through turbo (with boat loads of boost too) on the Stude V8 by more than one person. I bought a booklet off Ebay that had alot of info on that kind of stuff. IIRC it was by Dick Datsun (sp?) and it was titled 21'st Century Turbo. It's the same guy behind the Gator Spercarger site:
http://www.gatorsuperchargers.net
