There is no mention of the cr by the OP, but assuming 10.2-10.5:1, ported rpm's, that sized cam, intake, carb, on a 408...... Should be right in the 500hp range(if the valvetrain is stable enough to allow the motor to reach its natural peak).
And it should be over 500tq.

Assuming it weighs as much as my heap did when I first slid my 383 in it(3670 w/driver), if I apply the "90% rule"(the car should be able to run within 10% of the dyno crank hp, using the Moroso slide as the reference)......that's just shy of 117mph(450hp@3670).

If you had a 4500(or higher) converter, it's likely going to have some amount of slippage..... Seems like 7% is fairly typical.
Then if you have it geared right to use up all of what the motor has to offer, running a 28" tire...... 4.30's look about right.
4.30's, 28" tire, 7% slip, 117mph...... Works out to just under 6500 through the lights.

I'd be surprised if the current motor combo would actually "pull" through to 6500.

Each little step you take away from that scenario is ET you're probably not going to get back.

As a motor comparison, we did a 410 last year.
10.5cr, rpm's with mild clean up(265-ish), easy on parts sold roller, victor intake, qft-850 carb, pump gas.........538hp/524tq.