360 Magnum vs 340 mild street build - my experience

What did the '70 Duster "all original" run in the 1/4 ? ever try it ? I know people that bought them brand new and tried to get into the 13's with 3.91's and couldn't with the only thing changed from show room was slicks.
13.9 @101 was best for my 70 340 cheater slicks 3.23 gears