I've owned several cjs 4, 6, and 8 cylinders all have been daily drivers and this is what i can tell you from experience.
my first jeep cj7 4cyl with 33s = no power, slow on incline on highways.
second jeep cj7 8 cyl 360 with 33s= lots of power and nice sound but 15 gallon tank will be empty at about 100 miles or so. It was bad on the wallet, someone here said get a 20 gallond tank i will agree.
third jeep cj7 6cyl 258 with 33s= best of both worlds good in gas and plenty of power for what i need as daily driver and occasional trail riding. But i do
miss the sound of that 360, and i've been thinking in installing a 40 series flowmaster which it will make my 258 sound alittle better but never quite like the 360. good luck.