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I have a 68, i mocked up some 3rd gen camaro swap headers i have. And it looks like they should clear perfect. I suspect the 98-02 fbody lingtubes will work.
I dont know if the 77 chassis and frame is similar though.
Good luck
I tryed some 98-02 f body headers and they did not work. Had to cut the trans ear off and then the collector was inside the frame rail on passenger side. The driver side dropped in but I could not shift cause the rod hit the tubes.