I ended up making a custom adapter for mine. Its from 2004 so I don't know if the damper design has changed any or not since then. It is part number 720311.

P7030166.JPGWater Pump Project 7.jpg
67 Coronet 500 9.610 @ 139.20 mph
67 Coronet 500 (street car) 14.82 @ 94 mph
69 GTX (clone) - build in progress......