If the car will see a lot of track time I would go LS7 and keep the dry sump or better yet go to an external dry sump pump. Managing the heat soak on a blown engine is very difficult to do for a car that sees 20-30 minute track sessions. The innercoolers are generally not efficient and there's very few electric pumps available to flow enough water to cool the intake charge well enough. If the LS7 heads scare you (I've never had a problem) then you can always use the LS3 heads on the LS7 block. If you want to keep the LS7 heads have the concentricity of the guide to the seats checked and set the springs up properly and you'll be fine.
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