They have the 1 3/8" bore (as opposed to the 1.5" bores). CFM is 750 - 800 depending on who you ask..
The Thermo-Quad was available with two primary throttle bore sizes, 1-3/8" and 1-1/2". Flow ratings (CFM) vary depending on the source, but the TQs with the 1-3/8" bores are listed as 750-800 CFM..