Best guess on 416 motor

Mad Darts engine had a high 250's cam, 615 lift IIRC with 10.2 compression. It made in the low 500's for HP and TQ.

Look at w2Dusters engine. 10.5 ish 254 hyd roller, 10.85 - 122 and more still there. He's got 4.10's and 28" tires.

That combo has 10's in it.

Probably has a bit too much gear in the car. Put 4.10's in it with a 28" tire would be the direction I'd go.