Question about a edelbrock rpm on a 383 with 906's

I have the thing mounted on the engine now but there is a opening about in the middle of the heads on each side that the intake does not cover. It looks like a closed off cavity but it just seems to me it should covered?? The other question is I noticed that the stock intake has ports for antifreeze to flow through it but the valley pan on the eddy blocks off the flow through the intake. I know these are silly questions but just makin sure