Hello, I have a 400 small block that came from the factory with 255 hp and 390 ft/lbs. Now I have done a few small upgrades and would like to hear what you think the power output would be now. I have installed a Weiand action+plus intake(#8004), a Comp cams 280H, Hooker headers, 4 barrel 650 cfm Edelbrock AVS carb sitting ontop of a one inch 4 hole carb spacer. i would love to be close to 300 hp power and 415 ft/lbs. i would like to hear from people that could tell me a very close if not just close estimate. This is for my sons birthday, I have been building it at a buddies house for 6 months. His old engine had a pretty nasty crack in the cylinder wall when we pulled the head. THANKS!