Bruce; "Tri-Power" is a copyrighted term; Pontiac (ever hear of them?) is the only brand who can use that moniker... Are your Pontiacs triple carbureted???
The A-Body Darts with 440s were never given multiple carburetion, only an embarrassingly smallish 4bbl that took YEARS for anybody to figure out how to make run...
Steve Wann had one on his B-body about 10 or 15 years ago that flew, but I don't remember anyone else doing well in Stock with one, until now.
Congrats to Mr. Smith for an amazing performance!!!
Bill