My 79 blazer has over 250K and runs OK when it runs. It was a barn find.
I’d like to put a chevy or ford engine in my CJ7 since it needs a new powerplant. Generic motors and ford parts are a lot easier to get than some AMC.
If/when that Willys engine goes, I’d love to have a V6 like some Willys CJs had.
I replaced it with a 350. It took me about 2 years off and on to go thru everything and make it driveable.
I started out with a Carter 500cfm 2bbl carb, but I couldn't take off on wet streets without breaking the tires loose.
Once I replaced that carb with a 390cfm Holley 4bbl( with tiny primaries) it was much more easy to drive.
I have also since converted it to dual fuel, using forklift propane tanks.