Maybe the sedans did not have the stainless trim? Don't know just supposing.A '66 New Yorker came with a single exhaust 440-4V.
This car, while very nice appears to missing the trim that goes below the lower body side moldings as shown in the photo below. Therefore I question whether the car is a true survivor and the missing trim may indicate that the car had some rust through repairs.
View attachment 209153
I think that trim was standard for New Yorkers. Didn't notice that before........Maybe the sedans did not have the stainless trim? Don't know just supposing.