850 or 950 Carb

Maybe, maybe not. Using a 7,000RPM redline and 90% volumetric efficiency (which is rarely attained) your engine should not ever pull in more than just under 750cfm of air. Going bigger may actually result in reduced performance because the air velocity through the carb, and therefore the booster signal, may never reach the level required for the carb to go full rich. You can use jets the size of your finger and you will never acheive a proper A/F ratio. You will always be a little too lean because, due to the low air velocity, your carb will "think" you are at only part throttle. My car has a 383, .030 over TRW 11.5 to 1s, worked 906 heads with big valves, and a solid cam with 528 lift and 241 duration @ 50. When I bought it there was an 850 on it, on a single plane. The best MOPAR guy in town suggested that I pull the 850 and put on a 750. It was one of the best things I ever did. Once I sorted out the correct jetting it made better power and was more responsive than with the 850. When it comes to carbs (and cams) bigger is usually not better.