The '66 Imperials have one styling cue I do not like. The reverse lamps are in the bumper, rather than a part of the taillamp assembly, like in '64 and '65. Other than that, the '66 has the '64 and '65 better in many ways. The rear axle in '66 changed from the tapered axles and those damn drums that require a puller, to the more modern axle and drum set-up. Of course, first year of the 440! The AM/FM radio became available. The trunk lid no longer had the "Imperial" letters in the center of the trunk, but were now a less conspicuous script on the right side of the lid. The grill on the '64 is actually my favorite, then the '66 and the '65. The interior trim in '66 is more tasteful.
All in all, the '64 - '66 Imperials were rather understated, as compared to the '61 - '68 Lincoln Continental and the '63 - '66 Cadillac Coupe deVille. With less trim and a more sculpted look, the Imperial is a rather beautiful car, as compared to the clutter of the Cadillac and the dated look of the Lincoln and Cadillac both. To me, of the three cars, all made a beautiful convertible. If one were in the market for a coupe, the Imperial again wins in appearance and overall room. In each, the four-door hardtops are all still attractive automobiles; yet the Imperial again pulls off a subtle luxury where the other two tend to go in a more gaudy and ostentatious direction.
In the late '90s, I owned all three makes at one time - a '73 LeBaron four-door hardtop, a '62 Continental convertible, and a '66 Coupe deVille. It made for an impressive, though a little cramped, garage! The Lebaron was blue with the white top and blue brocade and leather interior. The Lincoln was a green-gold color with a white top and dark green leather interior. And the Cadillac was white with a tan leather and cloth interior. All were in great shape overall! The Imperial and Lincoln were both classic auction buys, and the Caddy was a buy from an estate sale where I was the sole bidder!
I owned the Cad a mere four weeks, when I was driving it around and stopped for gas. A guy in a '78 Seville pulls up and wants to look at the car. We talk for a few minutes. He offers me considerably more than I paid for it, though it was not for sale...until that moment. So, I sold it! I still see it about once or twice a year. Still looks great!
The Lincoln was a car I traded a beautifully-restored (by me!) '67 GMC Suburban, with a 327, auto, heater, AM, and all three seats. Damn nice truck! The Lincoln was a restored car, but ran "quirky". That big 430 Lincoln engine had a weird setup with the oil pump drive. Traced that down, and sold the car to a guy in the Bay Area for pretty damn good money in 2000!
And the Imperial went to a guy in Kansas that had the same, identical car he bought new in 1973. He repainted the car, and drove it for several years.
OK, I kinda rambled a little and got off-topic.