1991 Chevrolet K1500, 4.3 V6, approximately 130k miles. I've owned this truck for about 6 years. The seals have been bad since I got the truck. Finally decided to have them replaced. Compression was good in all cylinders (140-170). Valve guides are a little worn. Other than no more blue smoke and having to worry less about checking the oil, what benefits might I possibly see from replacing the very worn valve stem seals?