Ahh just purchased a nice 1989 vert with some mods. The iron heads have the numerals 22 on the right lower front of the head. My old cars had gt and gt40 stamped in the same spot but 22 never saw it before and did a search. Getting back in the mustang saddle after selling my old 347 1987 . I have tried ford charts with no luck and the parts counter guys I interact with daily .