The issue would be the accesory drives liek for the hypdraulic pump, etc. They may not be available for another engine & then you have engine mount & space issues to design. Then when you are ll thru who can remember what parts were used to make it work?? The Namco is an older than dirt vehicle & with all the fuluid drain it's value is what teh scrap yard would pay - right now scrap prices are pretty good.