New update:
Ive been busy the last couple days but I finally replaced the water pump, coolant temp sensor (had overspray on it), and installed a second new 180 degree thermostat. I also installed a coil spring in the lower radiator hose since the hose was soft. I just ran the engine and it still overheats. I popped the radiator cap while the engine was warming up and there is still no flow.

So I'm thinking the block passages are full of sediment/rust or perhaps head gaskets were installed wrong, which is blocking off the coolant passages. It's pretty frustrating