I bought a '66 Nova SS with an L-79 (350HP 327) new in June '66.
It had 3.73 gears and a close ratio 4 speed.
Totally stock, with street tires ( 6.95X14's) it ran 14.6 in the 1/4 mile.
After changing to "cheater slicks" and with open Jardine headers, it ran 13.8.
I had 4.56 gears later, but never ran it at a timed track with them. I would guess it ran about 13.2 with the 4.56's.