dont forget that 750 cfm Q-Jets came on Pontiac's sohc 230 motors-big cfm but did have pretty small primaries, the front butterflies were 1-3/8 dia (35mm in Hank talk). That motor was a smooth idler with a little extra compression and with near header-like cast iron dual outlet exhaust manifold, and I think with two 2" dia pipes that joined into a single 2-1/2 pipe. Just the other side of the coin.
