AMC V8 Motors as they are in Jeeps. 290, 304, 360, 390, 401
The most common Jeep V8 motor found would be the 360. CJ's came with 304's. And while AMC made everything from the 290 to the 401. They all share the same basic block design. And while there are some flaws in the design, the overall build of these motors is a very sturdy construction.
A good resource for strange AMC parts is Performance Automotive Wharehouse, or P.A.W.

AMC Engine Pros.

AMC Engine Cons.

AMC Engine Specs. Updated!!! No really!

AMC Engine Modifications.