4.56s on the steet ?

OK I get the point but this car only will see the high way twice a month and normally is relegated to back road driving and an most a 30 to40 mile trip the cars and auto with a built 340 and 2800 stall converter but I was hoping for the ability to have a working posi because mine is dead in the water but I need help getting the proper diff for the car


What rearend do you have now, you didn't say?