Make sure the rockers are not hitting the spring retainers . Sometimes you need to grind a little clearance on the underside of the rocker. Since you changed the valve train, common sense tells you to look there first for the noise. Good luck.

How Did He Adjust The Rockers?? 1/2, 3/4 Or 1 Turn????
ALSO WHAT CAM IS IT AND WHAT LIFTERS DID YOU USE???
DO YOU HAVE THE 502 VALVE COVERS OR HP 500'S ??

What does the noise sound like?

Mine's been making noise for a couple of years. Don't know WTF it is. I'm down to just assuming piston slap and going with the run it until it dies method. Mine's a stock 502 though, and it's been rebuilt at least once. It has about 250-260 hours since the rebuild, and it's been making the noise for most of that time, if not the whole time.

Hey BIG Daddy skool is held evenings at the DEJA VU house of ill repute Lets go

Bill, so it's night skoool, that's just perfect cause i'm an OWL ! thanks 4-the-invite - ROCK ON -

Is the motor fuel injected? I have had fuel injectors that made so much noise it sounded like valves.