Carb Advice - 440 Drag Only

Port work was done several years ago & I'm not sure how well they'll flow. Just some cast iron 346's. They're free so i'm going to try them. Foot brake this year. Transbrake likely next season. Should be approx 2700lbs w/ driver.

The Comp Cam XS290S looks like what I'm shooting for .540 / .558 lift

During some carb reading, the article mentioned that the 950's actually have smaller venturi's than the 850's. Any truth to that?