I just picked up a 1975 Mandella 20' v-drive mini day cruiser. The boat previously belonged to AZMANDELLA. Super clean boat. Being my first v drive I have a few questions. First off is prop size. Just finished a fresh solid roller 468 BBC Approx. 470-500 HP at the crank. Built to spin 5500+rpm all day. Currently the boat is direct drive with a casale in and out top-loader w/rev (18% gears). The prop is a brass mfg? 12.75"×15 3 blade but has seen better days. I'm not looking to make a drag boat here but any suggestions would be greatly appreciated.