Using dirty dingo mounts, you can clear stock truck accessories, so any truck engine will work and are usually the cheapest. The engine will be forward of the factory position though, so if using stock trans, mount will have to be moved. Some people like dbw, some don't, so that is preference. Dod and vvt are the same, want it or want to simplify it a bit? Even a little 4.8 makes good power, so if its cheap enough, jump on it. Although 6.0 torque is nice.