Original tires

Better just to keep them and just put them aside just for originality sake but I definitely would not use them.

 

Absolutely! Do not drive on thirty year old tyres, that would be much too dangerous. Keep these for concourse, if you want the car to be as original as possible.
Seven years is my usual limit for changing tyres, whatever the mileage might be (My mileage in seven years with either of my 328 is very low).

Rgds

 

I wonder if you can successfully remove and refit 30 year old tyres from one rim to another?

 

You can. There's also a great chance of the bead ripping when you take it off the rim or put it on the new rim.

 

I would save the Original air

 

I think 1980s air from Los Angeles was pretty corrosive.

 

Lol