Hi. Here goes.
396021 "F" code from beside oil filler tude says 68-72 455.
Head codes are between exhaust manifold, and valve cover, three didgets either side of center bolt. Six didgets in all. Let us know.
Also, if the "935" matches a "935 in the last vin #'s to the car, It MAY be #'s Match. let us know what you find out.
Jim.