Custom Cometic head gasket pics

Just thinking out loud here.... It seems to me, that if you wanted to get coolant past the exhaust valves faster, it would be best to plumb the rear crossovers and front crossovers into a manifold. The water flow would need to be reversed, so it comes out of the radiator, into the manifold, into the heads, and then you could pull either from the sides and front passages in the block's jackets, or just from the front to feed back into the radiator. I
I'm not seeing an easier exit for that coolant you're feeding into the block jackets. I think you're going to have worse hot spots and problems. Again just thinking out loud.

I forgot to mention that I do plan to run rear lines from the heads into the front manifold. The exit volume would be the same as stock but more equally distributed. Reverse cooling is a different plan altogether. It cools the heads first, but does not flow any more than the passages allow. I am not trying to cool the heads first. I am trying to increase the amount of coolant to the hottest area of the block which is between the two opposing exhaust valves on each side of the block first. The small passages in a stock gasket prevent this.