BY U BOY

Looking for info on any 21 excel's that have or had a blackhawk drive. Does this boat respond well with the drive. I have been thinking about it for a while.Even though i have been thinking about selling it to upgrade i may have my old lady talked into keeping it and getting another so i would like to make a rocket out of it. Plus i think the rooster tail behind a 21'er would be very cool.

What pitch prop would i need if i am running a 25p hydromotive now at 68.5mph.