Chasing a squeal, need opinions.

[BLACKLS5]

I've been chasing a squeal in my Dad's '71 4-speed Chevelle and am looking for opinions on what it may be. I sure sounds like it's coming from the front of the engine but I know how noises can travel. Here's what I've done to this point... Eliminated the power steering by taking the belt off, tried two different alternators, changed all the pulleys, took the fan clutch off and replaced it with a spacer, numerous different belts. I thought it had to be the water pump right? It's the last thing on the front of the engine, Nope. It starts about 3500 rpms and it sounds like a dry bearing.

Early in my testing I checked to see if it did it with the clutch in or out. It makes the noise regardless. Neutral or in gear same thing. I thought that would eliminate the throw out bearing but maybe not? I'm getting a bit frustrated as I must be overlooking something simple, I just don't know what. Anybody have any suggestions?

Thanks, Troy