I tried a set of Hedman headers for the 67-69 Firebirds and they were not a good fit at all. After driving a bit the passenger side that I did not have to modify was damaged. The drivers side I had to modify two tubes. I know that Hedman's will not work, but maybe some other brands might.
I will say again spend the money on Doug's headers the flanges are much heavier and seal better and they seem like a solid header where the Hedman's were not solid feeling when hanging the exhaust with bad welds where they seal. Even after filing flat I never got them to seal good.
Pat
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