Well, Tony, after you asked the question, I started searching again, and I thought maybe I was losing my mind - I couldn't find it either for a long time.
Try this link:
web page This might be a discontinued part. I'm very sure I saw one of the price lists that had a part number for the 4.8l/292 before.
Of course, with the additional information that the used 292 is complete, was running and you trust the seller, $450 doesn't sound like a bad deal at all. I'd say go for it.
---> Bill