That cam seems awfully small for 406 cubed sbc to me. I ran 2 versions of the comp cams 280/480 in the late 80's. It had a pretty good chop in a 355sbc with 041x heads. Ran 13.0's on vacuum secondary and street tires. With a DP carb and slicks it dipped into 12's. 125 shot of laughing gas went 11. 70 at 119mph using nitrous only 2nd and high gear. I was told a 400 would swallow up that cam.