Dwayne, Chrysler Corp. played the same game for years with Plymouth and Dodge, and to a large degree with DeSoto as well. As for Mercury, the car had a really pronounced i.d. of its own for only 4 years, from '57 to '60, when it was neither an up-line Ford, nor a down-line Lincoln. Some components were still shared, esp. in the power train, but each make stood out from the other two as a separate car. Part of the overall prob with Merc was that FoMoCo could never seem to figure out where the car fit in the product line-up scheme of things.
For me, the prettiest Merc ever was the 1960 Parklane 2-dr hdtp. One of our parish priests in Muncie bought one, a metallic bronze beauty. A local family that year traded an impossibly beautiful 1956 Packard 400 on a metallic turquoise Parklane. The Packard family took a horrible loss on the 400, as the dealership asked only $995 for it on the used car lot, from which it vanished almost immediately. Never saw it again.
BTW, does anyone on here have a Mercury Professional Car?