Duster 11sec?

I agree with Don on the gear and converter. When my Dart had the 340 in it I ran a 3.91 gear and a 275 radial. Made the change to a 4.30 gear and same tire. It only picked up .05-.06 in 60 and the 1/8. It ran 11.60 @ 116 and change in the 1/4 @ 3240#.