Well, the good news is that you got an early 219; the nicest of them all, IMO. The bad news is the condition, but of course you would have paid a LOT more for a cherry one, especially in Richifornia. I know, I'm there too.
What's the bore condition like? Kinda crucial if you intend to shoot it. If it's rough, don't give up on it until you actually shoot it on a range--.30-30s can look like crap and still shoot "minute of muley"! Uncle Mike's Bore Paste and a little elbow grease can do wonders to smooth up a rough looking bore. Just don't overdo the elbow grease.
That external rust could be greatly improved with a generous, careful rubbing with a penetrating oil like Kroil and BRONZE wool. Some recommend the finest grade of steel wool, but I recommend against it--it is harder than the oxide layer we call bluing. Bronze wool is more expensive but much softer than bluing and harder than rust. You can get it at most big hardware stores and online from gunsmith suppliers. Soak each area you are going to work on in penetrating oil and let it sit for a while, then rub away at the rust spots.
You will be amazed at how much rust will go away when you wipe off the brownish goop! Again, go slow and don't overdo the elbow grease! Spend a few hours on it and you will be amazed at how much it will clean up. You can take your time with this project and clean off one area or one part at a time, wipe it off and set it down until you have the time and energy to do another.
Let us know how this project goes! Nothing back bringing an old rifle back from the brink of extinction to give you (and us) a warm feeling!