Finished S/C install, engine knocking ~

Okay here goes.... I just finished installing my Powerdyne 9lb. kit on my 89 5.0. I also changed the starter, plugs, wires, distributor cap and rotor, and radiator. This took way way too long by the way. I can't believe they claim 4-5 hours install.

Anyways, I start the motor and it immediately makes a clicking/semi-banging noise at idol. I shut the motor off within 20 seconds. My friend points out that I forgot to add back in the coolant. Ahhh. I am assuming 20 seconds wasn't enough to do any serious harm since the noise started with the first crank of the start up. Is this correct? My buddy said it hapend because the water pump had no fluid in it. So I waited 15 minutes until the engine was cool to the touch, filled the radiator and started it again. I shut it off immediately because this noise scares me so much. What is going on?

If anyone can help please respond. I am worried that I will screw something up and blow the motor. Also, do I need to prime the water pump? I imagine I have allot of air pockets after I drained the whole system.

Thanks in advance for any help.

I guess I'll try removing the accessory belt and turning everything individually. Then run it without the belt. I think I should purge the water pump however....