Building a 393 for my 69 Fastback and while taking apart the 351w that is in there, I was pretty surprised how badly recessed the exhaust valves in three cylinders had become. One of the valves is the thickness of a 50 cent piece into the head. Hopefully you will be able to tell from the picture.
Remember, if you are using old heads, put hardened seats on the exhaust side.
Remember, if you are using old heads, put hardened seats on the exhaust side.