A few questions

[Finnatic]

Hello all it's been a while that I've posted anything and have a few questions. I have a project boat to do with my son. It's a 1972 206 CC. I've had the boat for 3 years now and have it completely striped down ready for the nasty work. I'm freeing up some time these days and want to remove the entire deck and transom. I want to raise the deck to make it self bail also want to raise the transom to accommodate the newer 25" shaft motors. Is 4 inches enough to raise the deck to install scuppers ? Also is 5 inches the amount needed to raise the transom, it's my understanding they ran motors with a 20 inch shaft back in the day. Thanks in advance.