Regarding the air bleeds:

I have a similar setup as Bullit on my 340.

When I was using a 750cfm Proform main body on my double pumper It ran rich and throtle response was not as sharp as my 650dp. I called Quick Fuel Technologies and they suggested I change my Primary screw in air bleeds. Original bleeds were #75 outboard and #36 inboard, Sugested change is
#70 outboard and #30 inboard.
All secondary air bleeds are #36 (no sec. mixture screws.)no changes being made.
Coast is $4.00 per set. I am waiting for delivery.