We ran a 9375 1050 on a dish piston, hydraulic cam, vortec head 406. It was faster than an 800 and deadly consistent. The converter did stall about 5000, which helped a bit. I also ran a 1250 on a 447 SBC, a tenth faster and 20 HP more on the dyno, made as much torque 1000 RPM below peak torque and made more after that than a 1050. If you have enough converter and gear, a bigger carb (within reason) can usually be tuned to work better. Fish, no reason you cant get the 1050 to work good on yours, just realize an out of the box Dominator will usually need some work to get right, some models more than others.
What model # is it and is it an HP model or earlier Dominator?