S/B stroker block prep
I couldnt see what you're talking about, but there is one of a done 402" on Ryan's site, you can see what I meant. The lines are not in core holes, but plummed straight to the heads' water crossover ports. The rears are not connected in this pic, and you can see the small lines from between the chambers running down I beleive to the lower part of the block. these pull heat fromt he block first, then up out of the heads' crossovers into the water outlet/manifold/box thingy. I'm proposing reversing that using the water coming out of the sides of your pump, and running into one end of the heads, and the opposite ends running into the box.