Grumpy was interviewed by Doug Boyce for the book, 1968 butternut yellow, L89. Joe Carella even shared a picture that shows that IV had a '68 trim tag. I've got a contact who was close to Bill who has the vin, and this guy is extremely credible.
I'm no expert on the early years of Pro Stock but I think you could not run a '67 in 1970 but maybe one of you guys knows more about it.
There is nothing to discuss about IV being a '67.
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