FSD engine stamping code

[R72K5]

anyone have any idea what FSD stamping code is on 80-85 sbc engine ? casting is either 14010201 or 14010207 i cant tell which, and the heads are 450 casting- early 305 267 262, it is 2bbl and originally blue in color so its 77-up heads at least

nastyz28.com shows no FSD stamp

google either

im putting new valve stem seals and head gaskets on this engine thats stuck in a 79 c-10 pickup, not original engine to truck of course


thanks for anything