This is a slip from my 63 Sport Fury with my pump gas 493. Its a solid flat tappet cam of 264 & 270 @ .050 with .585 & .592 lift on a 110 LSA and has Indy EZ heads. I use a Luppo Dynamic 9.5 converter and I shift around 6200 when I actually do look at the tach and trap about 6400. Thats using 4.30's and Hoosier 30 x 9 radial slicks. The cars weighs right around 3700 without me. Never dyno'd but going by weight , et and mph it should be around 600 flywheel hp. You got a lot more in it and you need to find out where its lost. Good luck with it. Ron