John......what is the +1 for?

Re cylinder heads........your guidelines state that parts not available up to end of 1960 are not permitted. Well the Cooper S cylinder head was not available till 63 or 64........ has bigger valves etc so cant be used is the way I read it.

I wasn't aware that superchargers are still made, and if they were would be of modern construction and design, therefore not permissible.

Maybe I am reading too much into your guidelines, but to a casual observer like me it all sounds very restrictive, which is fine if that is what you mean. And this is where problems come in. People are always trying to bend the rules to their advantage, in any sport, and motoracing in particular. They always have and always will so maybe the guidelines have to be more specific or people will interpret them differently as I obviously have.