Chasing a squeal, need opinions.

[BLACKLS5]

It does it with the car in neutral and under load. It has GM deep groove pulleys on it now but I switched back to the standard pulleys to eliminate the pulleys as a problem. Although it will spit the fan pulley off at high RPMs with the standard groove pulleys. The alignment sure looks good to me. Is there a sure fire way to check other than eyeballing it? Width and bevel of the belts? I don't know, I've tried NAPA, and O'reillys belts. Tell them what the application is and go with it. Gates brand on there now. Jason, I say no on the water pump because that was the last thing I changed a couple of days ago. I thought I had it narrowed down to the pump. It was the last rotating part on the front of the engine.

Let me throw this out there... I swapped out his 396 a couple years ago with the current 454. With the 396 it had a squeal when you shifted, just when you shifted, so I figured it was a bad throw out bearing. Obviously installed a new bearing when I changed motors and noise was gone. It was fine for a couple of summers. Last summer he mentioned that it started to squeal above 3500-4000 rpms. Would a worn bearing retainer that the throw out bearing rides on cause something like this?

Thanks for the suggestions. I'll try the hose idea or buy a cheap stethoscope to try and isolate the noise a little better.