Normal
I like the idea. Sort of like the hopeless class in the IBR. Possibly use the IBR guidelines for a go-by? Notwithstanding ScooterG's comment, I think it would be easy to enforce. Specify a year cutoff, say 1980 for example to almost ensure you have carbs and not FI, then also specify that nothing can be on the bike that wasn't available from the showroom floor. Then have a witness verify the machine is in that condition. Easy peasy.