Replacing 225 water pump

I would use Permatex "gasket sealant" on the outer interface. It is a violet, tacky liquid that cleans up with ethanol. It comes in a small bottle w/ a brush. You can also use it to coat bolt threads that go into the water jacket or block (oil leaks).

Good point on the short hose to the head. I used silicone hose (ebay). It is expensive, but not for 3" and should last forever. I was replacing it w/ pump on the block and being more flexible than normal rubber hose made it much easier to work in. Also used special silicone hose clamps (Euro ones work).