1st car:
1966 Dodge Dart GT, 273-V8, buckets, green inside and out, auto trans, console, a/c. Owned from 1979-2002. I modified it over the years: 4-bbl 500 cfm Carter carb, Holley intake manifold, electronic ignition, shift kit, 3.23 gears replacing the original 2.93s, removed the a/c to lose some weight, unsilenced air cleaner.
It wasn't a muscle car, but could do 0-60 in 8.5 seconds and low-16-second 1/4 miles and get 14-18 mpg.