Great bicycle,
I have an 81 superior and it runs like a dream. Rides really nice. I had a hard time finding mine as well. I wanted the 23 inch size (23.5 actual size) and it took years. Keep in mind that by 83 they were using some left over parts according to my buddy that worked at Schwinn here in Chicago those days. So the seat post and sometimes the handle bar and stem would be changed depending on what they had in stock.

You said you are putting Super Record on it. Are you changing the brakes? you may have reach issues. I believe that this bike has regular reach brakes and most Super record are short reach. You may want to check that out.

I kept mine stock except I put large flange Tipo Hubs and a Nuovo Record Rear derailleur on it. Its weird having a paramount frame and a rear derailleur with a steel cage on it so I had to upgrade it. I have a fairly large stable of bicycles and this is my favorite bike!