Overheating Big Block

[mprat]

Well hell just when you think all is well and you have found your overheating problem. Well just before I put my engine back together I decided to call the engine builder to complain, well according to him those head gaskets are correct for that engine and he has built hundreds and those lower three water ports are supposed to be covered. What the hell. Ok someone out there has to have built a 90 model 454 chevy which is a mark iv and the correct head gasket. I am losing my mind. I look at pics of gaskets on the computer for that engine and it shows those lower three holes open. The engine builder says it will cause hot spots in the head and over heat. Well hell its over heating now. He says I have done something wrong on the cooling end of it. Of which I have found nothing wrong. I have built tons of early big block chevy engines, never had a problem on which head gasket to use. Just order the correct one and install it. it should not be this difficult...