Tip Top Garage has all the Delco Carburetor bulletins available online, which include all the part numbers for every part in our Quadrajets. 1963-69: http://www.tiptopgarage.com/pdf_files/63_69buick_apps.pdf 1970-79: http://www.tiptopgarage.com/pdf_files/70_79buick_apps.pdf Perhaps I'm the last to know?! -mike