As stated earlier MMR makes a full rotating assembly for the 3.7 Check out some of solobusa's threads. He blew his engine with a procharger and then started a build from a brand new short block for a turbo. He has his rotating assem. made by MMR
And to finish the story, he blew that motor up to. I don't know if he's performed any forensics to determine exactly how it happened, but I don't think it was the fault of the bottom end.