Okay, had this tappet noise and rough engine, missing cylinders 2 and 3 and gas pooling in the intake manifold. 144K on engine. Took the valve cover off today and there are 4 rockers (I know they are not really rockers) from the intake side laying in the head casting. The camshaft nuts were loose, turned by finger. So, where do I go from here? Should I assume the problem was because of the loose cam bolts and slap it back together or do I need to look for parts or a different head?