It all depends on what you want. A mild street only engine for going to and from car shows and cruising, I would believe a crate will work or you could do it your self. If you want a race engine with big power that will last find a reputable shop that specializes in MOPARs. He will know all the little tricks required inside a race engine to make it reliable. There's a big difference between screwing an engine together and building an engine.