Welcome aboard! Yes, that sounds like a pretty good buy, specially for those chamberings, maybe the top 3 most popular!! I'd put each barrel on without the forend and make sure the barrel locks up good with no looseness, it was made in 1991, so it may have a lot of miles on it, or just been a closet queen!! If the barrels were factory fitted, the last 3 digits of the frame serial number will be engraved on the left side of the barrel underlug.
You can shoot levergun loads in it if you want, but most folks don't like the recoil, so they stay in trapdoor loads, or low levergun loads, it also depends on who's data you're looking at, Hodgdon and Hornady put their trapdoor loads in Lyman and Speer levergun levels, but Garrett and Buffalo Bore don't distinguish between old or new Handirifles, so shoot what you can stand.
Tim