Have you had any issues running your pressurized carb, Bill? (leakage etc.) I believe I heard Holley has specially made carbs for these applications. I used to hear stories about carb floats getting crushed from the boost.
I have TWO forced induction cars that I try to run and they have both been subjected to "blow thru" modifications tha included replacing the floats with "nitrophyl" (solid) floats that won't/can't collapse.
Other than adjusting the air/fuel ration to achieve a user-friendly 11.5:1 ratio under boost, and keeping plenty of fuel pressure to the car, I haven't had any issures, leakage or otherwise. The carbs are both 4150 Holley 750 double pumprers.
I cannot stress strongly enough, the critical importance of acquiring some sort of wideband A/F ratio meter to monitor the richness/leanness of the carb settings under boost.
The one I use is made by F.A.S.T. and is really easy to install and use
Those things are not cheap, but I simply cannot IMAGINE trying to do a forced-induction installation without one. I just couldn't do it... and if you miss on the "tuneup" on the lean side, you just bought a motor...