Bar Bet Winner!!

Good info. From what I understand, the smaller versions of these carbs had the same size throttle bore/blade, but the secondaries were restricted to only open a pre determined amount.
I myself have only used these carbs on engines where gas milage was the big factor. They always seem to get 2 or 3 more mpg's than T-Quads. Had one on a 318 headed 360 with an SP2P in a 74 Charger, and that car used to knock out better than 20 around town and very high 20's on the highway.