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The only “better” way to cut the cylinder holes out that I can think of would be to either find a tube or pipe that is close to the correct diameter and sharpen an end. Use that tube for a hollow punch against a piece of end grain hardwood and tap it through with a hammer. One could also do a bit of lathe work on a piece of tuning or round stock and make a little more precise punch if one was so equipped. 😉.
As for the water holes, as long as the gasket isn’t a big restriction compared to the OEM one, I don’t think it will be a big deal. I would want similar area to let water through, but the pump can only put out so much. That’s my 0.02.
-Ben
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