Actually this is the one for the YJ:
Also peruse the www.advanceadapters.com
I decided to go with a GM engine for my swap. The engines are more common and the swap has been done many times so there's more info and parts available. I thought about the V6, but since it has only a slight HP advantage over the 4.0L for much more work. I decided to go with a V8 Vortec engine. 5.3L Vortecs
are very common and Novak says your NV3550 should handle it. You'll need a bell housing adapter.
According to Novak: "GM engine swaps are almost invariably easier, more productive and more affordable than Dodge, Ford and other conversions. These companies make some great engines, but you have to pick your battles when doing a swap and going with a well supported, well documented, easily acquired and broadly familiar powertrain is a key to success and satisfaction."
I'm going with a 6.0L Vortec. I figure if I'm going to do this, I'm going all the way. But I'll have to swap out my transmission too, as well as the rear end.