456 gears

71dustya said
Its mph 116.78 the car ways 3260 with me in it

With 628 HP you should be trapping at 130 or so and be running 10.00 range.

116 at that weight is about 350-360 at the rear wheels

You're losing a ton through the driveline or the dyno was very happy.

What converter are you running and what's changed since the dyno to the car.

Is the fuel supply adequate. A holley black isn't going to feed that engine adequately.