Here's a pic of the int gasket:
You can see how they are separating due to the exposure to the hot
oil.
Now I'm thinking valve seals, which were installed by the shop that did the head work. They convinced me to have them install a type that supposedly were better for hi perf engines, as opposed to what I had provided to them, but I don't remember what type they were. I'm going to remove rocker assy's to ck the roller tips (they were not turning, and were beat flat when I got the car, had them rebuilt ) so that would be a good time to change seals.