Whine when Revving

1970 Plymouth Valiant 318

When I rev the engine, I'm hearing a whine coming from the engine bay. It's hard to pinpoint, but I think it might be the fan clutch. Anyone got any insight on this? I have a new Champion radiator on the way and was going to keep the fan clutch, but will gladly convert to electric fans if the fan clutch is the whiner.
Thanks
Danny