If you are using carbon head gasket is best to let the head and block without any modification. This will ensure long term durability for the engine.
If modifications are made on the head and block, it will change the compression ratio of the engine. This will reduce engine durability. Things will most likely occur, head gasket leak due too often boosting (Supercharge & Turbo).
But if you use steel head gaskets.
This is a different case.
Just a personal opinion base on experience.