I bought a mitshimoto radiator local to me for $100 and felt the quality wasn't worth much more than that.
Make sure there isn't a bunch of slag left in it and where the tube meets the end tanks.
Mishimoto radiator for the 6.0 is a very poor design acknowledged by mishimoto... Their radiator for the 6.0 actually runs alot hotter than a Ford factory radiator. There was supposed to be a redesign September of 2016 but they just keep putting their customers off.