I've got my engine totally apart and on a stand right now. Should I replace the freeze plugs as long as its apart? None of them leak and they look to be brass from the factory.. I was going to just leave well enough alone but they're so cheap and easy to get to right now I'm having second thoughts.

 

If you don't need to clean out your water jackets, then you don't need to remove them. Most blocks I work on need extensive cleaning, so they come out.