Originally all of those things should've been keyed alike but after 35 years, very possible that some things have been replaced. Mine is an '83 and every lock was different. And unless you're absolutely positive that the ignition is original, you'd be taking a chance getting one made using the VIN.
Most folks say that a decent locksmith should be able to make a key by impression on the ignition. They're sealed up pretty well and not impossible to take apart but it requires removing it and then bending some metal on the switch body (and a lot of fiddly small parts waiting to fall out from inside). I think most locksmiths would rather do the impression thing?
As for keys, the original blanks are getting harder/more expensive to find but they're out there. There are a few blanks from other things that will work, I know there is one type that fits an old model of Volvo that has the right profile, for example.
So the key thing isn't an impossible problem to take care of but as Dogshome said, I'd be concerned about not being able to check out it's runnability.
