To the best of my recollection, the A's and the ADL's are older 336s, but the receivers were square bolt.
While the do command a premium, $920 is absolutely ridiculous money for that piece. There is a guy who lists on Gunbroker under the name Kidbillions that puts those kinds of prices on his firearms, and needless to say, they have been on there for at least two years and counting.
IMHO, I would say that $400 - $500 would be much more like it.