Is my 3dr any good for entering Concours ??????????

As i would love to have a go at it . we do work on the car all the time to make it look better and its been Rebuilt from the shell all the way up to wot it is now .....1 BIG thing i need to now is its a motor sport shell will this stop me from competing . And if i could have a go at it wot class would i need to go into