the manifold was not just cool because of clearance, it means a less extreme bend in the primaries so does release power too
the dry sump doesnt actually achieve that much more clearance on its own, the pan is only thinner in the main pickup section of a stock one, where the manifold would not be running anyway, the main advantage is you can mount the engine at any angle and still have pressure, which is something you will have to consider anyway olly, cornering on slicks will mean you want at least a baffled sump i reckon