Older Jeeps with the AMC derived 4.0 and 4.2 liter inline sixes were bulletproof, now not so much.
My project 82 came with a blown I6.
The plan until recently was to get a reman of the same.
My dad has what is very likely a good shape 304 that came in a dead CJ5.
A friend of mine had a ‘70s era Jeep that he was restoring. I can’t remember the year but it had a big honking inline 6 that pulled about like a V8. Wonder if it was one of those AMC engines.