[new to this]

OK i need a little help here i was getting ready to mount my heads and the new felpro permatoque head gasket and i notice that the holes in the head gasket for the coolant port closest to the intake is not as large as the hole in the block .is this normal. i believe the block is was made between 1970 and 1980 the seriel number is 3970010 . i just do not want to have an overheating problem when i put this motor in my 69 c-10. take a look at the pictures and tell me what you think.