South Carolina Mopars

I have two 489 casings sitting here, 1 is a 3.23 non surgrip, and the other is 2.76 non surgrip sitting on a E-body axle. I also have a 742(?) 3.23 suregrip, that my dad said Im not allowed to sell, but would trade it for a casing with 4.30 suregrip gears.