I had a '68 Fury III Police Package (build sheet verified). It came with factory disc brakes, dual exhaust, 383 commando, and dual mirrors. 727 of course. In low mileage-stock form it ran lower 15's with even the factory carburetor still on it. About 4400 lbs at the start line (no spare or jack, me in it). I thought that was respectful considering where the car dated and era.
We added 3.55's, a weiand intake and 750 holley and dropped down to 14.7's. About a half second drop. Not at all fast, but when all considered, respectful.