Today, there's really no telling because of the age of the car and how its been treated. There have been a few to run high 13's completely stock. The average you will see now is probably around a mid- 14.
I just got back into these cars after a few years, but back in the early 90's when the motors were all fresh a bone stock 5.0 5-speed with a crap driver would run a 14.9, a great driver power shifting could do as well as 14.65.
My car 99% stock except the timing set at 14 degrees(The missing 1%) ran 14.40 and 95.87 week after week. I could run ET with ease because the car ran the same if it was 98 degrees out or 67 degrees it did not seem to matter.
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