The Roaring Season

AFAIK, Can Am didn't mandate the "stock block". Look at almost every car, Porsche, Ferrari McLaren Lola, ... None of the "factory" cars were stock block. All were race engines, OK some of the Chev based things were similar, but Reynolds, amongst others were making non stock blocks.
Never let the truth get in the way?

That's the way it always was for Cranky Frankie...

By manipulating that story into every crevice over a decade or two, all many years after everyone's forgotten what really happened, he could make it look like the Yanks expected his SR4 to wipe the board over there.