The old 451 11:1 compression dished ROSS pistons (pump gas) with B1-B/S heads, and a solid street roller, only 251/251@ 0.050", 0.614" lift, M1 intake, Holly HP 1,000 cfm carb and 2" hooker headers. Full 3" TTI exhaust with superflow mufflers. Only Chassis dyno 457 HP, 446 TQ at rear wheels.
The 499 is 12.4:1 compression flat top ICON (440 source kit) pistons, Edelbrock Victor MW heads, 264/264 @ 0.050" comp HXL solid roller, 0.720" lift, 4150 Indy single plane, same carb and headers as above (for now.) Chassis dyno 560 HP, torque was below my converter, one reading shows 505 TQ, another 630 ft/lbs? This is when I was having issues with the heads. I plan to flow the heads, and maybe pick a larger cam and use bigger carb.