Currently running a pair of NA 540's. Turning 4900-5000 30 pitch 4 blades 78.5 mph. I need a carb, cam and intake change but what prop is common on the 33 AVS with 1.5 drives with 500hp's?

Your speed seems low and slip seems high. How sure are you about the power you're making. A 33AVS with 415hp/502mpi's and stock 28" Bravo1 props runs about 80mph.

Not sure on horsepower but still prop slip is high.