Do they have emission testing in Baton Rouge? If not, do a search on here for "Nutter Bypass" and "timing"--start in the YJ forum, then maybe try the CJ and Engine forums. A lot has been written on de-emissioning and modifying the 258, and you can squeeze a pretty good amount of power from it by de-emissioning it further by adding a better carb, such as a Weber. Best thing is that most everything I'm referring to is free, except the Weber of course (which is far from free).
Check it out, and come back if you have more questions--
Currently an '86 CJ-7 and a '77 CJ-7 Golden Eagle---#4 and 5 following a '01 Sahara, '90 Sahara, and '85 CJ-7....