mid 90s 32' fountain,bought 740 hp 572s for it.was wondering what I was going to have to do to the outdrives to be trouble free?replace the whole set of drives or would changing just the lowers do it?will be on smooth lake water...no ocean.thanks for any advice.

Yes to 1st question. IMHO.

That depends if you drive a boat the way I drive a boat or if you drive a boat the way your grandmother drives a boat.

Do it right or you are going to be changing drives like a Nascar team.

Most times not enough!

The upper is the weaker half. You could run an IMCO SCX upper with your lower.

Trouble free and bravo don't go together. Unless you have a 25' bayliner with a 305.

Are you running on Smith Mountain Lake?

572's I assume are tall decks, I just want to see how those fit.