18-spline 4-speed trans value?

Yup i know about the strength differences those 18-spline boxes are virtually the strongest (and heaviest) 4-speed manuals ever put in passenger cars... i know it's a b-body unit since it has two shifter mount pads. I searched and found a for sale thread where a guy sold one for $700 but it needed a rebuild and looked like sh*t compared to the one we got.