Restoring a M1 Garand and a M1 Carbine?

Hi, i recently inherited a M1 Garand and a M1 Carbine from my Grandfather and was wonder, would restoring them diminish the value or raise it. The wood on both of them is a little beat up and the actions and barrels has a little rust and alot of gunpowder residue. I want to take them to my local gunsmith and have the wood sanded and relacquered and all of the metal cleaned and polished, but would doing this lower the value to collectors or raise it? Any information would be greatly appreciated. Also i had the serial numbers checked out and they are authentic to their times and not fakes. And if anyone knows what kind of price i could get for them ( fully restored or not). Thank you