Pretty standard practice to add a quart when using a street car (i.e., one without oil pan baffling) on the track. I doubt very much that one additional quart is going to cause any issues; you'd be hard-pressed to see the level in the pan high enough in use - especially high RPM use - to catch the crank and cause foaming.
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Life's tough. It's tougher when you're stupid. -John Wayne
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