M1 Single Plane Question

Here is my combo

68 Cuda Notch
275/60 M/T
4.11 Locker
Dynamic 3200 stall
A999 w/2.74 1st gear
408 Magnum(Formerly 380 Crate)
4.00 Eagle Crank
175-185 PSI Cyl. Pressure
Forged Pistons
OOTB Eddy Heads
M-1
MSD Ready to Run w/MSD 6AL-2(one silver, one blue spring, w/black bushin)
Electric Fan
Underdrive March Pulleys
Hughes Roller Cam, 238 and 242 @ .050, .555 int. and .585 exh.
Crane 1.6 Roller Rockers
Trying to figure out which carb(750 QF and a 950 QF, both D.P.'s) and messing with spacers