What are you wanting to do? Are you wanting to swap the engine out for a smaller cube engine? or one not as built as your current. If so then that is easy to do with the AMC engines. the 6cyl and 8cyl egines share the same trans and bellhousing, so either engine will bolt right in. If you go V8 it is a direct bolt up, if you go 6cly you will have to change one motor mount (drivers side I believe)