So my brother in law took a look at it and said it did have a disease, noassatall
He said it certainly wouldn't do well at a fair, but that it was still a good trade for the sheep. He agreed that it "wouldn't hurt" to worm it, and that the weight we were told was probably a little high, but not outrageous. (I forgot to ask if he could guess at an age).
I got what I think is a great deal on rolled corn and barley mixed, so I have 1,245 Lbs of grain, and about 1,600 Lbs of alfalfa cubes (5/6 of a ton). I'm feeding the cubes basically free choice, and feeding about 15 Lbs of the grain, 7.5 in the morning and the same in the evening. The two ram lambs I have are able to get a little of the grain, so they'll probably be a little on the fat side when I sell them as Christmas lambs.
On another note, I got a halter on him yesterday. Despite the size, he was pretty easy to halter, considering it was the first time he had been haltered. We left him haltered to a post for a few hours then left the lead rope to drag over night. He seems to be doing well with it. I just need to be able to lead him by the time he's ready for slaughter.