Just how quick were the 273 Commando's in the Quarter-Mile.

My totally stock (exc electronic ignition) 273 2 barrel 65 Signet ran a 17.00 with 2.76 gears- in late 80s at 75/80 near Frederick MD
one would think that the commando with 3.55's would be worth more than a second on this..... kind of strange.