your vin shows up in the magazine aritcle posted on camaropacecars.com says ys 715 next to your vin I think in the article. Looks like some kind of fleet order starting w/ a late 226vin. Also looks like every time they ordered 3-5 of them the 1st couple in the group started w/ a fleet code after the dash like the pacecars. I guess it could be possilble that the fleet code was some type of option like 15inch wheels that yenko got from the factory or something but he ordered in bulk like 50 so it came w/ the fleet code on tag. If other dealers knew the order code maybe they could order an ss w/ whatever his came with and not go through him for one of his cars. Where yours has no dash and fleet code, possibly because the dealer found a way to order just one on his own so no fleet code, there were like 5 yenko distributors on advertisements in 67 for yenkos in ohio but I don't see your dealer on there. Maybe yenko got a list of all the SS's that got ordered w/ his options whether part of his fleet or not from chevy and later submitted it to nhra. Just a guess why yours doesn't come back to yenko or have invoices, but it does show the ys# on the other site. Good luck. Not all were converted 427s, some stayed 396s and even some were 427 hydraulic conversions w/ turbo 400s...