Mopar purple .520" cam?

Check here;
Mopar Engine Cam Chart
(It's a Racer Brown camshaft STX-21 108)

Racerbrown.com. ???
The best I found unless you go to Facebook
Racer Brown Inc


That 312/312-.606/.606 was the BEST solid cam DC had. That thing was a killer. Still would be today in a stroker. Great cam.