If anyone stumbles across any info, pertinent to making this swap happen, please post up.
I have been digging around and not finding much.
I have a J32 in my sandrail, pretty impressive for a stock engine, I think a J35 or J37 would be awesome in an MJ.
Light, cheap, and decent power.
I have contacted Kennedy and the only adapter they make for the J series is to a VW bellhousing.