Already time for a cooling system rebuild.

Picked up my '74 Swinger (318) from the paint shop a couple of weeks ago. Drove it to work last weekend to repair an exhaust leak, then my dad wanted me to pick him and take him for a cruise down the Natchez Trace Parkway. The whole time, it's running fine. Bought new alternator, A/C, and power steering belts on my day off and drove it to work this morning so I could change them. About two blocks from work, the cap on the overflow tank popped and out spewed coolant and steam. Heard a groaning noise as I pulled into the shop, maybe the water pump?

Since the car is now stuck at work, I don't have the luxury of time to troubleshoot what went wrong, so I'm just going to replace/rebuild everything. There's a radiator shop nearby we use for that work, so that's easy. I've been on Rock Auto looking at the various water pumps, thermostats, etc., available. Being a Mopar newbie, I'd like to ask what do you guys recommend for replacement parts?