Yeah - you're right. That was ONE consistently good thing about the '60s (but then, I love all old cars).
But, the very last of the '60s, many of them got too big-looking (bulky and too long drawn-out). I love big cars but the proportions of some of the "small" muscle cars of '69 in particular - Mustangs, Chevelles, Chargers, etc, got a bit wacky from their mid-'60s origins, which were just right. IMO, of course.
Good thing is those cars are so old they are exempt from emissions testing...