Polara shared a very and I do mean very similiar build design with the new yorker and new port with only very minor diferences in trim and other bits and pieces but drive trains were almost the same between the readily available 383/413/426/440 depending on the year. Where it differed at would have been the intake system and thats where the new yorker prior to 65 was a true sleep with the cross ram intake that super cooled the air from the carbs wich would be located almost above the inner fender wells for a total of two four barrel carbs. Im drawin a blank if any other mopars had this same configuration but I do know there was atleast two variations of the cross ram intake and the largest of them will easily fetch $2,500 bare with no linkage or hardware what so ever and up to $1,500 broken depending on the condition of the breakage.
I almost forgot about the push button transmission wich also set apart the cbody mopar's.