The only used once, Boss 429 Bardahl Torino, prepped by Holman Moody Stroppe

Also an odd historical note, the 69 full race Torino Talladaga's had Boss 429 engines, but none of the publicly available Torino Talladaga's came with a Boss 429, they were instead fitted with thte 428 CJ, not as powerful... sad. http://en.wikipedia.org/wiki/Ford_Torino_Talladega

Holman Moody on a Shelby 427

Picture taken at San Diego Balboa park annual Auto Museum car show, Mike took this one, only time we've seen this engine... nice. Damn nice.