Tolerance of water pump play?

Got it apart. Cleaned and prepped for the new water pump, i cant believe how much corrosion had already started around the hoses on the water pump. I also decided to pull my pass front intake bolt as it would slightly seep coolant every once in a while, took it out and upon removing it i heard a little puff of air, what caused this? I put some #2 permatex back on it and reinstalled it.

Ready to install the pump just need to run to the fastener place to get some new bolts for the water pump, clutch and clutch fan. Think im gonna go the stainless route.

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