Lest ye forget the 11th commandment, o’ ye of little faith:
Thou shalt not question the Shaman or his charge.
Inherent all I6 Cruiser DNA, a mantra chanted on the production line from onset through at least 80 production-
‘Keep it stupid simple’
Considering production overlaps/the various engines used throughout, the unchanged radiator support and external tranny cooler, logic says that radiators from beginning to end have a high probability of consistency, at least mounting and orientation.
I’d bet the inlet and outlet hoses are all that differ, if any, with exception of the very few that may not have been AC equipped.