Good Evening
The 72 is a RB motor (413) 4 bbl A/C, P/S, P/B, standard cool (Not sure about the cooling though).

According to Classic Auto Air, the 72-74 has the filter drier located in front of the condensor. The 72 that I have has the bracket for the drier under the hood.

Was there different locations for this or is this a catolog fax pax?

Personally, I would like to have the drier in front of the condensor as it would be cooler there...
Omni