I turn a 15 1/4 28 over 6k with my 434 small block with a 1.47 gear ratio

I'm turning a 30 bravo prop non labbed behind a healthy injected small block at 5200.Blew a drive last year but dont't know the shape of the drive when I started.Just blew the upper. Changed it and am still going.JOHN

you can use a bravo flywheel coupler it works real good,
I'm puttin over 500 hp to the water in a 21' scorpion. still only a couple months old