Definately want to have the matching parts.
Looks like three different radiators with three different fans could have come with 440 auto in '68.
Your car has no A/C now, but if using the small diameter a/c water pump, it needs the matching pulley ratio and probably the taller, deeper, fan and matching radiator.
https://board.moparts.org/ubbthread...-stamp-vs-metal-stamped-part-number.html

1969 radiator p/n are different.
https://board.moparts.org/ubbthread...emi-charger-radiator-fan-215-or-216.html

Also interesting is that the Police cars got a different radiator. They might flow more or have higher capacity??