I have a Director Special in good representation if you need an example. These appear to be very rare and certainly the heat got to them. Mine has a heat shield, heat sink, or whatever you want to call it attached to the top to help diffuse heat near the distributor. Unfortunately the ports side is deteriorating and I cannot resurface it for use again. This is on an original car that was stored under cover or in a garage, but certainly cared for so the Director made it for a long time. Here is a picture I took before we started breaking the engine down this week. I would love to find another but I have spotted a Red Head locally that would look good perched on top a regular manifold for shows.