If the formula is big engine, hipo parts from the factory, light weight body, than why not a 57 Chevy 210 with the fuel injected 283? The 210 was lighter than the Belair 283 was the biggest engine Chevy had and with fuel injection (exotic at the time) made one horsepower per cubic inch of displacement. That was big news for 1957. I think this is a subject that could be debated until the end of time and you won't find a consensus to it. I feel most do agree that it was the 64 gto that started it. However horsepower wars were going on before that.