Radiator catch can
 

In the summit catalog which radiator catch can is applicable to 1988 na?
store.summitracing.com

Just use something with about a 1 quart capacity.......there is so many different styles at summit....just pick something you like in your price range, its only a can, its not going to be made for the FC.

Or just go to my favourite catch can supplier.....your local beer store. They have king cans that work excellent.