Whats the best time for a factory stock duster 1/4 miles ??

I got my '68 FB FS 340 in June 1969 from the original owner. It had 17,000 miles on it and cost me $1700, plus $100 for the Cragar's on it. Never saw the original wheels and tires, so he must have left them with the shop that put on the Cragar's. I took the 'Cuda to all the drag strips in SoCal and had 350 timing slips before I had 60,000 miles on the car. Best time was 13.48 @ 105.38. The only things not original were H70x14 retread tires with sticky compound and at the strip I droppsed the exhaust at cutouts that the original owner had installed. Not open headers, but at least not through the mufflers either.
At OCIR, the car weighed 3050. Not bad for a FB 'Cuda.
I suspect, but never could verify, that this very early build 340, built in Sept 1967, had the 4bbl cam as it was at least 0.3 seconds faster than any other 340 I ran across at the strips. OCIR was my favorite as in the fall the fog would come in and the car ran its best at 50°F.
I still have it after 53 years. It is getting new paint now after AMD did the rear quarter panels and valance. Otherwise, it was solid. Black on Black, and that is the way it is going back together.