Agreed steer clear of the Holly or equivelant 1250 shelf stuff for sure. They have to much throttle blade.

FWIW my 525 B1 had a 2.100 Throttle blade and made right at 1100hp. CFM wise it was in the 1180cfm range. I prefer three circuit carbs myself as it fits what I do. Some will argue that point and I understand their reasons, bit for me I prefer the third circuit.