What engines will work on my 03 foreman 450 es 4×4? I need a complete engine and I’m trying to broaden my options to get it going. I didn’t know if a 500 engine would work or not. I don’t mind and can handle a little welding and fabrication but I don’t want to do a lot of it. What other years will work?

What engines will work on my 03 foreman 450 es 4×4? I need a complete engine and I’m trying to broaden my options to get it going. I didn’t know if a 500 engine would work or not. I don’t mind and can handle a little welding and fabrication but I don’t want to do a lot of it. What other years will work?