On the intake manifold...
Opened up. I'm not sure if that is the remains of dirt or an old gasket along the edges of the metal backing plate. I think it was an oil and dirt mix that creeped in over time; there are two notches on the left side of the metal plate which would prevent a seal anyway, so a gasket would seem not to make sense.
Cleaned and painted, I used the NAPA self etching primer over that just some silver colored spray paint. I think I will replace the two mounting screws seen on the upper right of the photo....
