More info will be better, what size, horsepower, same
engine for same engine?
If the footprint is the same and you dont have any major
project in the engine room, like
repair roten engine stringers, or replace prop or shaft etc...is only the
price of the engine plus the labour to
lift up the old engine and drop the new one and screw it to the engine
bed , conect
fuel line,
water , trasmision coupling , panel,
electrical stuff and a dozen of small things , here in St marteen we can get a 4JH for something around 12000$ , labour i dont know , it depend of many factors.