Price seems very low for a repowered boat, that engine alone is worth more then they are asking, I'd be very cautious. EIf it is a 232 gulfstream for that price and repowered, something is very wrong I'd assume. If it is an older model and a 20' gulfstream from a while back with that repower it might be too much weight for the transom and boat to handle and sit correctly in the water and the owner is trying to get rid of her cheap. It almost seems like the seller is trying to get some of the value of the engine and giving the boat away for free. I'd ask for ALL service records, if they are not available, walk away. Ask for the bill from the repower, I repowered in 2000 and still have it for my old boat and the new owner will recieve that copy. Have the owner start the motor, listen for it missing or running rough, that is a bad sign if it does. If that checks out, I'd consider a marine surveyor and engine tech, if the boat is selling that cheap it may have been a salvage and the engine may have been pickled or will need lots of work, unless someone just has no clue what they are selling and is trying to unload it. Let us know how it works out. I hope all works out for you but something smells fishy here.