Just Purchased 1988 Wellcraft Nova W/ Twim 350 Mags( Moderate Engine Mods)

Engines Turn Between 4800 To 5000 W/ 22 Pitch Props . Is That About Right Or Should I Step Up In Pitch.

Sounds like your right on the money... you can check here for specific engine rpm ranges.....

http://www.outdrives.com/merc/sternspecs.html