Mopar 383 help please

Get a shop manual for your car, link: http://www.moparmanuals.com/mopar/main/home.asp
The shop manual will contain trouble shooting pages.
Remove the valvecover, start the engine( will get greasy) put your finger or a wooden stick on the rockerarms, one by one and see if the noice goes away.
If it gets quiet remove the lifter and have it cleaned, put it back and restart.
One way to see whats wrong.