2.5L mercruiser to 3.0L mercruiser swap?

[datsun280zx686]

hello. i recently bought a boat from my cousin. it had a 1966 mercruiser 110hp in it. my cousin didnt winterize it so now the block is cracked (milky oil) i pulled the engine out and found a crack so i bought a 72 120hp block. but it needs to be bored. i know if i get it bored ill have to change the pistons and rings. do i have to do anything to the head? also i bought another boat for the engine but it had what i believe to be a 3.0L omc. similar engine? previous owner painted the engine black, i know this bc its flaking off and the paint underneath is blue. would i be able to swap these engines? would it line up with the outdrive ok, or what would i have to do..any advice?

 

[Scott Danforth]

Re: 2.5L mercruiser to 3.0L mercruiser swap?

the 3.0 can be swapped for the 2.5. As for rebuilding your existing engine, yes, have your engine builder look at the head as well.

 

[HERBDOUGH]

Re: 2.5L mercruiser to 3.0L mercruiser swap?

the 3.0 can be swapped for the 2.5. As for rebuilding your existing engine, yes, have your engine builder look at the head as well.

is the outdrive also compatible with this swap ?