Note: I don't have the time or space to do it myself.

I've got a 2010 JK with the stock golf cart engine and auto trans. Ready to fix that problem, with a Hemi [probably the 6.4]. (Not interested in LS swaps either)

I found Rubitrux near the top of my initial google searches. Also found some other places like Exodus 4x4, JK Land, Modern Muscle 4x4, and Dakota Customs.

Are any of these places better / worse than others? And are there any highly rated places on the west coast? Somehow everything I'm finding is east coast, or at least Texas, where I expected most of them to be out here on the West coast with our better wheeling opportunities (edit: just found Dakota Customers which is in South Dakota so at least considerably closer than the other locations)

 

There is Americas Most Wanted 4x4 in Michigan. https://www.amw4x4.com/

Note: I have no experience with them nor do I have a Hemi in my Jeep.

 

amw4x4 in Michigan.
I have dealt with them personally and they are great

 

Smog is the main reason you don't see them on the west coast. For about the same money now you could convert to electric with tesla motors and batteries.