My car got recently overheated twice, and is now making a weird noise coming from the engine. Im planning on getting a new aluminum radiator soon, but someone told me to calibrate the valves first to get rid of the noise. Im not currently driving the car because until I fix this this problem. What should I do?  

Calibrate the valves? WTF?!

There's no such thing. If you overheated the car twice and it's making a knocking noise, I'm afraid you've cooked your engine. The overheating might have cracked a piston, or you it could've caused a crack in the block and/or heads.

Pull the oil dipstick. If the oil has a milky white appearance, the motor is toast. If the weird noise coming from the motor is constant, the motor's toast.

What year is your car? What motor?  

It's a 5.0 92' LX w/302 engine. I hope is not the motor. That will suck . I've already spent a lot of money on the engine. Could it be something else?  

It could be a blown head gasket.  Those usually blow first.  Then if you really heat it up you will crack a head next.  Then if you keep going you will kill the block.  You didn't anseer EZE-83's question though.  Is your  oil a kind of coffe with creamer color?  Do you see an oil slick  in your radiator?  Do you have white smoke coming out of the tail pipes that dissapates quickly?  These are important clues as to what you actually did.  If it is a head gasket that is a pretty cheap fix if you do it yourself.