chevy engine conversion

I am considering putting a 383 chevy small block in my 94 grand. does anyone know of any aftermarket mounts for this application. also what type axles are in the 94 grand, how strong are they? the truck will be used on sand dunes and I want more than the 4.0 has to offer. Has anyone ever heard of or preformed the SB chevy conversion in a grand cherokee. Any input would be nice as I am an idiot when it comes to the grand and its offroad capabilities and durability. I just want to do a project will be different and challenging. Thank You.