I had a 383 powered 67 Fastback with auto and 4.57 gears and a 440 powered 71 Charger with 4.10 gears.
I did the big block A-body swap when I was 16. lol
still have the car but It now sports a 451. lol
1977 Dad and I getting ready to install the 440 in the 71 Charger.