I think the goal for the 383 back then was a 14 flat at 100 mph quarter. Even those I'm guessing were ringers.

I'm thinking the 13.4 at 105 must've been the Hemi.

Average, garden-variety, bone-stock, non-ringer not tuned-for the-magazines 383 Roadrunner? I'm guessing most of those would run a low 15?