[Graham]

I’d like 8.5mm tires for all that motor and 1mm for Targa Florio please.

I think I’m close to ready these have less motor than the max.  

As a matter of interest, the Porsche 956 would be ok for the Millie Miglia 
The Porsche 904 for the Tour De France
The Porsche 906 for the Targa Florio

That's if we adopt the Historic Road Races, at the moment it is probably going to be a "Toss of the coin"