Hi.
Your right Art.
On April 23, 1957, NASCAR officially banned fuel injection, superchargers and multiple carburetors from Grand National racing, only a single four-barrel carb would be allowed.
NASCAR´s explanation for it´s change of heart was that officials claimed they were trying to keep private racers in the fold by ensuring financial parity, not all privateers could afford that expensive induction hardware, which actually came for free to the factory teams "Big Boys".
Then on June 6, everything changed direction as the Automobile Manufacturers Association also known as AMA, effectively banned automakers from actively participating in racing, something all in Detroit had always denied anyway, so the big factory teams where then instantly history.
Some of the drivers of the Black Widow was: Buck Baker (#87) (who also became the NASCAR national champion in 1957 with 10 wins in 40 starts and finished 38 of the 40 starts in top 10.)
Jack Smith (#47), Speedy Thompson (#46) and Rex White (#44).The exact numbers of the Black Widows produced by SEDCO is unknown, but according to a interview with Vince Piggins (the head of Chevrolets product promotion department back in the day) done by Super Chevy Magazine in 1981, it was as low as 10 because the SEDCO programs life was cut short.
That´s a little history regarding the Black Widow.
Best wishes
Anders Lundstrom
Malmo
Sweden