Lots of info out there, Google is your friend. Here for example:
The CJ2A Page Forums
The CJ 2A has a very narrow frame, it's weak, not a boxed frame; lifting Jeep and expecting to drive safely on highway with a 350, hmmm, not for me. I had a 1971 CJ5, with the stock 6-cylinder engine. Road like crap, stiff springs, short wheelbase, very rough. Sold it.