[Hurricane4]

Do you know if the Jeep originally was equipped with the F-Head 4 cylinder or the Dauntless V6 (Buick)?

Check out these sites:

http://www.earlycj5.com/xf_cj5/index.php

https://www.kaiserwillys.com/

 

[Hurricane4]

Additional info for engine swap:

https://www.advanceadapters.com/tech-vault/1-1941-79-general-engine-conversion-info/

The GM 4.3 Liter V6 is popular as well as GM & Ford V8 engines. May want to keep a lower HP engine in the CJ.

My Opinion: I don't know if a CJ5 is a good first vehicle for a very young driver.