273 questions...a few of them

Just for reference I never got a "cam card" when I bought mine either. Now that I look closer at the head, notice the spring seat being raised it is possible you are getting coil bind especially on the valves that stick up through the retainer more. 67 may be on to something there. My spring seats on my teen were not raised like that.

This fix might just be getting those springs up on the valve. Notice the difference between the coils in this pick.



PS. I wouldn't use the old retainers with those springs.