Seeing you are dry decked I would see where you might want to tap into the water jacket in the center of the head and route additional return line probably a size or two smaller than your rear exit. My BB Ford is likely to end up that way. Using a stock block completely filled I'll have little choice.
Have you put a temp gun across the head to check variences from end to end and top to bottom? Wish Pontiac never got rid of the original 55-59 reverse cool scheme with the "sprinkler" tubes in the head.
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