This^^^^ I can't really think of anything that isn't new other than that, if your not going to buy a New or Rebuilt 2150, buy a good used one, just make sure if you get it at a yard just to be safe throw a kit in it easy peasy. I have bought 3 2150's and not put a kit in them and they've all been bolt and go with only adjustments to air/fuel and idle, even bought a couple 4bbls at the local yard, couldn't pass up on a Holley truck avenger 670cfm for 40 bucks.