Should run in the 10s, I agree with Labratt, 3900 lbs. seems a bit steep, unless your 350 lbs. , It'll run better with a 4.56 gear & a 29" tire, The 950 is a smaller carb then the 4781 850, I think the 850 will work good, but like mentioned, A 1050 Dom. should work better with those heads/cam.

75 Duster, 451 10.87 @ 123.58 NA 97 Z28 6sp., 12.01 @ 115 on a 100 shot 71 Swinger. 360 magnum. 12.58 @ 105 78 cutlass, 469 BBC. 12.70 @ 108 on street tires. http://www.youtube.com/watch?v=Z2kqNmMfheU