340 heads or gasket leaking?

Thank you guys. The strange thing is that it happens when the engine is hot and only on one side (driver side). It is not a lot. Ignore the white stuff on the concrete - it is just black water, one side only.
I am going to do a leak down test and see if I can pinpoint a leaky valve or small crack/break in the head gasket.
Like I said the coolant looks good and I didn't see any bubbles in the radiator. But maybe I didn't wait until the engine was fully warmed.

exhaust.jpg