My 408 was in the HP range the OP is looking for. 360 block,.030" over, 4.00" Compstar forged crank, 6.125" Compstar rods, Diamond dish pistons, 10.8-1, flat solid cam, 260/264° @ .050", .628/.633" lift with 1.6 rockers, Curtis Boggs ported Edelbrocks, Ryan Johnson freshened them and installed 2.055" intake valves, port matched Victor 340, Biggs 950HP. It ran 6.57 at a tick over 104 in the 1/8 at 3240# on pump 93.