Jet pump?

Looking for a mercury v6 jet pump unit .... I have a small hydrostream I'm planning on making into a jet boat ...b4 all the guys who love hydtostreams freak out this boat is trash I think its beyond repair and make it a good boat to experiment on it is unmarried now transm is trash and a good quarter of the top half will have to be rebuilt. Back corners are about gone .....i have a few old jet skis and was gonna put a busa motor onto that ...i have a few drag bike motors but think a v6 Merc unit would fit better and less Fab work
Thanks ...im in northeast TN something close would be best!