82k10

Hey guys I have a 350 chevy that was in a 82 k10 when I bought it I got it running and the belts were squeaky so I bought new belts and cleaned the pulleys. Same thing, tightened them same thing. So I pulled the alternator belt and it went away. So I got another alternator belt. Didn't change anything. Tightened it more than It should have needed still no change. The guy I got it from put a new alternator and power steering pump on it and I'm starting to wonder if the pulleys are the wrong size? Anyone know what they should be?