Don't read if you're close minded

To cure curiosities & answer the question, the HP Holley 4150 series carbs are rated at 2"Hg, not 1.5"Hg. The 1000 HP is really ~=an 870cfm std. Double Pumper. The one on the 455 Olds I built has one, with annular boosters, not drop-legs. Runs & drives like a pup.