Water through Intake Manifolds

I'd like to start this thread discussing water flow through intake manifolds. For various reasons, we might alter our I.M.'s and those gaskets.
For example, on my 4 barrel, 273, I used a gasket without a passage for the exhaust heat riser into the stock, cast iron, single plane I.M. because I was getting carb boil, even with a 1/4" insulator gasket under the carb. (Now the center passages are very cold while the end passages still get warmed by the water flowing through the I.M. This is not true. I was mistaken. See my post #23).
I think I've heard of I.M.s with water flow through the heat riser passage, which sounds like a good idea. Not too hot and not too cold. So how could I modify my cast iron I.M. to accommodate this better idea?
Related discussion welcomed.
Thanks, Richard