That's a damn good looking CJ. If it's as clean as it appears, I'd jump on it before someone else does... now that you've broadcast the ad nationally ;-) Seriously though, if the rust has been removed properly (cut out, new metal welded in) and it's not loaded with Bondo, hidden rust, etc., it could really be a great Jeep.
I'd have guessed that to be a T-150 3-speed in that Jeep from the factory. Otherwise, it should be a T-176 - an option in 1980.
1981 CJ8, Chevy 5.7, SM465, D300, RE 4.5, 35" BFG MTs, 20/30 4.56, Detroits, Warn 9500ti