Do 13-inch wheels and tires have any value?

Here's my opinion, since you asked.
The tires are neat, correct or not, they have that look that is lost with all new tires. The size hurts you but the fact that they are 13's and not made much any more will give you some value back. Overall they will be the least desirable items of the bunch.
The hub caps are probably worth ten bucks each, on a good day, to someone with a Valiant.
The wheels could either be used as is for an A body, even as rollers, or sold to Stockton Wheel to be made into larger wheels. The small bolt centers are what gives those wheels value. Maybe another ten each here.
Hate to say it, but overall, the whole set is probably worth $40-$50 complete. You might consider breaking them apart if you are serious about selling them.