Any class for this old race sled
Hi, if it is still in full pro-stock trim from ice racing then it would fall into the Pro Sno 600 class. Depending on how "pro stock" it is and what you can take it back to, you may want to have a look at the Classic Super Stock class which is a lot of fun. The rules for Classic Super Stock are HERE.
Is there a classic pro snow
Not currently, but as with any class if there is enough interest it might be considered.