Have 6-17-71 dated 340

1971 340, all I can get off block stamping on the serial # pad is 2B2 9063. It looks like something was stamped between the 2 and the 9, I can't make out at all what it might have been and, even with the missing character there are still only 8 stampings on the serial number pad. Maybe a Friday just before going home time build?
Anyway, if by some far chance someone is looking for it, let me know.