The 750 Chrys fitted AVS carbs are 750 cfm, probably more.....
In my 77 catalog, there are 6000 series AVS carbs [ 6433 to 6437 ], listed as 630 cfm. The 9000 series & Comp Series AFBs are listed at 625cfm. Same pri & sec bore sizes, same pri venturi. The AVS does not have a sec venturi or...