I have a 1955 Thunderbird...when I purchased it in January it had been sitting since 2001....i changed the fuel tank fuel lines and carb...mystery oiled the cylinders and got it running. ..i noticed it was smoking a bit on the driver side..once i got the valve cover off that was coated with a tube of permatex, I realized that one of the push rods was not attached at the rocker..the push rod was fine . I reattached it and turned the engine over and realized the lifter was not lifting how can I tell if the lifter is stuck in tje up position or if the cam is damaged? Here is a picture of the heads and as good of a picture that i could get of the lifter.