The restrictor pill has to do with boost, and not the compression of the motor. . . Unless there's a magical part that I didn't know about. I would be more concerned that the numbers all match fairly closely on the compression test and not focus as much on the number specifically. It stands to reason you can just replace the parts that are bad, but you'll also want to figure out what caused it, if possible, so it doesn't happen to the new parts. If you're uncertain or unfamiliar with the parts you're going to be working with, get a shop to do it. Especially if it's as cheap as wagonracer says. I've never priced it out, but I'll do just about any repair on my car for that little money.