All of those early cams were made by the cheapest, low bid sub contractors that Mopar could hire
I can't tell you how many D.C. cams i bought and returned to get a good one, I stop using them due to the lack of quality.
If you decide to try and use one make sure and degree it on at least two cylinders, I like to check both #1 and #6 so I don't have the change the degree wheel for T.D.C. while checking those lobes