Truck squeals during acceleration

[Squareforceone]

My 84 with a 305 is squealing when accelerating it's always had the squeal during initial start up that many of these trucks seem to have. The truck use to squeal when i first started it and then sometimes when accelerating but usually a quick hard acceleration solved that and it went away for the rest of the time i was driving. But recently it's started to squeal during acceleration all the time at a certain point it goes away but as soon as i hit a stop sign it comes back again. The belts are newer and set at the right tension. I'm thinking maybe alternator bearings? Any other ideas or thinks to look for? Thanks guys.