If you are going to put a big port intake on a small port head there will be a sharp reduction in size at the head. Some fitting can be done but you may need a special gasket to seal it. I have that and you really have to pay attention. The GMC has 3 rings that help align the intake & head. I made a set that fits the big port on one side and the small port on the other. The ID is tapered to help reduce the restriction. I think it actually helps increase velocity.
"I wonder if God created man because he was disappointed in the monkey?" Mark Twain
