Overheating

[jlipman]

I am progressing in the slow process of bringing a truck back to life after sitting 10 years. This is what I've got. 72 with a 383. Engine was built and barely broken in before it was parked. The radiator (Griffith) was new then too so was the water pump. I have since flushed the radiator and installed a new thermostat. New twin electric fans with a shroud. Yes they are blowing the right direction. If I drive around the block and sit in the driveway for 5 minutes I'm pushing 210 and puking antifreeze. Tonight I watched the fans turn on at 180 and 185 and the thermostat opened and 180.
I saw water moving at 180 and the top hose got got hot then as well. I confirmed timing too. I hate to put a radiator in unless I am sure I need it. Should I throw in a water pump and see? I did let it run with the cap off for a long time and I believe it burped all of the air out. Heater lines are hot.

Anything else I can check?