I'd seen this video. But I suppose it just didn't register on me, at the time.
John Clegg bought his '73 SD455 Bird, brand new. He then took it to the '73 US Nats & won D/S with it. So, that means that at the same race where Truman fields won Stock & set a new nat record, John Clegg was the D/S champ. Those are 2 of the big names in Pontiac drag racing history.
http://missiongarage.com/photos.htm