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I think the lug bolt pattern will be an obstacle.



For '67-'73 the lug pattern is 5X5 inches. Plenty of GM mid and full size cars built with this lug pattern. Save the wheel hubs, just press the lugs/studs out and discard the used rotors and find some with the back spacing you need. You will most likely end up fab-ing new caliper mounts but you are going to want to go big on the calipers anyway, so all in a months work. Good luck and keep us posted on your progress. Check Wilwood as they have an assortment of hat depths and a choice in rotors. Maybe something will be close enough to work for you.