How much would a new head gasket or new block cost if cracked to replace on a 1989 Galaxy 21' bow rider?

was a boat for sale and looks great from the pictures posted otherwise, but i've never owned 1 before thanks for your info|||galaxy does not make an engine. don't buy junk. don't buy a "fix-er-upper" if you can't do the work yourself. get it???...don't do it.|||Depends on motor. I'm guessing you have an I/O. If block is cracked you can get a re manufactured long block for about $2k to $2500 and take all the accessories (intake, exhaust, starter, valve covers...) from old motor and transfer them to the new one. That's for you average GM V8. If it's a blown gasket you could probably get both sides for $20 or less, but I would have the heads planed.|||it totaly depends on what engine it has and if your able to do work yourself.I personally would stay away from the boat.More than likey it was not winterized properly,or not at all.If they neglected this what else did they neglect.