One of my main competitors when I was running the 70 Boss w/the 427 was a 67 GTX with a built 440. I managed to beat it, but that car was Georgas!!!
Had a custom paint job … white background with blue ribbons and shadows … I really liked that car. Ironically, he sold the body but kept the 440. It is currently in a Duster race car that runs in the 10s. He is younger than me, but can't drive any more. His son drives it.
My favorite Ford bodies (if money were no object), 67-70 Mustang Fastbacks, 55/56 T Birds, and 66/67 Fairlane's. I like my current Mustang because the body resembles those of that era, plus it has much better suspension, AC, power windows, a 5 speed, and variable cam timing. For a daily driver that I take everywhere, it would be tough to go back.
My car is a 2006 with almost 140,000 miles. I blew the original engine at 118,000 mi and replaced it (the new one has Eagle Crank, rods + pistons), but the rear, tranny, AC, alternator, radiator, power windows, and ps are all original w/o any work. The classic cars just never had that kind of reliability.
That said, the new ones with IRS are a big step above. My brother and I drove one as a rental in FL, and we were both very impressed with the combination of ride quality and handling. My ride quality does not compare.