Thanks for the information, seems like I have a few good choices to pick between. Temps here in Georgia aren't too severe, we rarely see temps much lower than 20* in the winter.
As far as the mileage goes, I really don't know...I haven't driven it enough to really calculate anything. I really wouldn't call it a slug, either, feels like it has more than enough power for the little CJ. My '94 YJ has a 4.0L 6 cylinder, and even though its rated at more HP, it feels like the 304 is a little stronger off the line. Of course, the YJ only weighs around 3300lbs, and I'd bet the CJ is under 2800 lbs, so its not like it needs a lot of power!