my buddy is buying a 1994 31 w/ 502 mags anybody have this setup or close to it and if so what prop and pitch have you found to work best for top speed.

I have a 32 Fountain with 502's. Im running 28P Bravo 1 4 Blades. You wont be happy with the 3 Blades or Hydromotives. Im moving to 30P Bravo1's after my Blowers are installed. Good Luck.
I just posted the 28P Props in the Classified Section if your interested.

I don't know what his drive ratio is, but 26 or 28 bravo one props would be the ticket. Mirage props don't work and Mirage Plus are barely tolerable.