Hey it looks like to me was the line up of the cam set in too far into the block, the lifters have to line up in order to get the lifters to rotate. It does not take much to wipe out a cam. My dad raced in the sixies all we ran was mechanical cams. Only once was he concerned about the line up of the cam. Also without the oil holes lining up you could have starved the cam for oil. Also the oil runs down the pushrod if the oil was not getting to the rockers you cuold have starved the cam for oil. Sorry bout that. Im getting a lot of info that Ive forgotten throughout the years by reading about others. Again Im deeply sorry.