Mike,
I was scanning thru my restoration guide earlier today, 64 and 65 are calling for gloss black on the frame. (I think this is a typo and the frame should be 60% black) This link is from amazon and preview the GTO restoration Manual. Click on view and zoom in to enlarge the page.
Amazon Online Reader : Pontiac GTO Restoration Guide, 1964-1972 (Motorbooks Workshop)
Control arms and all components are 60% black;
MaL, nice project, keep the pictures coming.