“Best” all around axle ratio: ~450hp w/ A904?

Go with a 2.76. Just think of how much better your gas mileage will be.
:poke:

2.76:1...don't laugh. A few years ago a fellow pulled in to our strip with a Duster running a 408. Promptly
ran an 11.76!
His rear gears were 2.76! Said his problem was traction!