I would put a rebuilt engine back in it for 6K and dump it. If you repower it, you have to fab it in and resale will take a huge hit cause few people want a machine that has been specially fabricated to install a different engine. It simply would not be worth it unless you plan on keeping it forever in which case a different engine option becomes more viable. Still the PINTA tax is always high on those types of conversions and personally the machines are not worth the effort in my opinion.