Hey, Jim... care to jump in the mix on this one???
I have a 1968 Donzi 2+2 18' barrelback v-drive. It has a SBC in it. I assume it had some BB ford or something originally. Anyway, it has trim tabs and the tabs have to be down quite a bit at speed to keep it from porpising. The shaft angle is 9 or 10*. (been a while since I checked) This seems pretty steep. Tops out at 50 ish.
I have not played with prop position. It is getting ripped apart to recore the deck. Now is the time to change shaft angle if it is a good idea.
What do you think?
It will get a 383, alum intake, and lose a bunch of weight in the process. The current engine has the circulating pump, raw water pump, iron intake, etc. All that crap is going. Cam driven water pump. velvet drive trans in it too.