new combo missing a bunch of power?

[pfordamx]

whats different? the old motor was 9.5 to 1 stock stroke 390 with a 238@.050 hydraulic flat tappet with some iron heads that flowed about 260@.700 a torker and a 850 holley behind it was a 904 and 8inch 3800 stall converter and 4.10 gears car ran 11.50s at 115 at the time the car had all stock suspenion except caltracks and some 90/10's and almost wieghted the exact same took out a 6 point steel bar added 10 point molly cage. out side of that the car has been completely rewired and re plumbed fuel and brakes have been redone the whole front end has been gone through. its basicly a new car theres not much to compare from the old combo the heads flow 40 cfm better its got a much bigger solid roller, 3.5 points more compression and 30 cubes on the old combo but somehow it is slower. the only similarity is the 4.10 gear and 28 inch tires although we went from a bias ply to a probracket radial.