I believe they use the same system. you can use the whole system just cut the down pipes from the 66/67 and weld flanges. if the system has the x pipe the only concern is that the old down pipe arangment will line up to your header collectors. I am sure if it is off you can either shorten or lengthen the segment that will adjust this alignment. if the system does have a X pipe the instulation may be a little further back than in a 68 and up car. (not sure) A tape mesure will assure all is good. As mentioned the tail pipes are different but that is not a big issue. The pypes system is designed to use OEM hardware so you are not going to have to figure too much out.
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