Welcome, Tony...
Is 'very bad damage' to power-head? and the rest of the motor, lower unit (the drive) and all that OK?...if power-head replacement is what you need, I think there are certain replacements from OUTBOARDS that can be used for that purpose...as Willy said, we've got some pretty sharp guys around here who can advise you on that...
If your sea-drive is shot to the point of total replacement, I would agree w/Willy except point out the Etec small block 200...light weight and as smooth as a 4-stroke w/out the WEIGHT of a 4-stroke...if you're going to buy new, that'd be my advise...
Post up some pics of your boat...we'd like to see!!...
