I took it apart again and found that either I hadn’t tightened it enough or the gasket failed. It was definitely the water pump leaking. I managed to get it back together and it holds coolant now, but for some reason it is leaking…gushing oil on the filter side of the oil pan. I have changed the oil pan gasket (lots of fun there) and it still is gushing oil. Where else could it be leaking from? This car is driving me nuts!