I see a red painted timing case cover, and a black painted block. Was someone in the timing case? Maybe the cam is too far advanced, and causing it to run hot? I had a problem with overheating once in a SBC Nova; turned out to be a broken centrifugal advance spring in the distributor allowing it to run too far advanced; I chased that one for a while. Be sure to post what you find that solves the problem I am Butch/56sedandelivery.