Wow!!! That's a lot of carb for that combination. IMO an 800 would probably work better and offer a lot better driveability on the street.... 950 would be more for like a 496-540 incher with the huge 345 runners and a narly roller cam.. I only ran a 850CFM on a roller cammed, Kaase design SCJ headed 501 incher on the street and it was just about perfect on air/fuel ratio from 1500 to 6500 rpm....

Down jetting a too big carb can cause other issues in the part throttle and mid range rpm....though it will probably work fine at WOT, the engine might be fat and lazy at anything less.....