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Correct, its not open just to F308-11 and F312-317 cars, but the F305-7 can't compete and the F302-4, F399-01 and older cars are going to be worse.
Monoposto will take up to F307 cars providing they are raised to 40mm and have appropriate restrictor - 25mm for International or National F3 or 28.5mm for the Piedrafieta engine used in Spanish F3 - both those are slightly smaller than F3 Cup but Monoposto don't want these engines having an advantage.
The Trophy Class for older cars is open if anyone wants to enter a single round and win a championship. The open class doesn't acrue Championship points and is effectively for Monoposto cars who want to race in a more expensive championship. The invitational class was used a couple of time last year for current Euroformula Open cars.
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