Help with 489 Sure Grip gear ratio options

You could prob find a good used complete diff, with hiway gears, you could prob go open,, for less than a new set of gears,, and leave that beautiful 3:55 suregrip complete,, jmo

That makes some good sense - current plans for the car do not require a sure grip or the higher ratio, but in time I might like to take the car to performanceville, and then I could pop the 3.55 sure grip back in.