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On a race only engine, a power valve isn't necessary if the carb is set up properly. I've seen guys use them, but more as a crutch when they have another problem.

If you do decide to block it off, you'll need to increase the primary jets. A good starting point is go Square.

Give Quickfuel a call. They can get you pointed the right direction and save you some trouble/time and money.

Paul.

I use one ( on the primary side only ) in a race only application. IMO, it keeps the plugs cleaner idling around the pits, on the return road, and in the staging lanes.

Fastest 300