766hp@3150lbs.......
Assuming a 10-12% loss for atmospheric conditions and parasitic losses....... 675-690hp.
Should be good for about 140-141mph.
Assuming the typical 10% converter slip, 4.10’s would put you in the 7000rpm range.

That isn’t a problem as long as the valvetrain is set up for that, along with the oil system.

4.30’s seems like it would be a bit too much gear if everything is working as it should.