Living with 3.91's

Hi guys,
Ive come across aset of 3.91s for my Dart. Currently have 3.23s, but wanting to go faster and get into the 13's.

motor is 360/727trans with good parts/2400 stall convertor

Just like to know what it is like living with these gears on the street

Not much worried about mileage cos the gas is so expensive anyway!