In short, the stall speed is the speed at which either the rear wheels will break loose, or the engine will stall. A higher stall speed means that you can get the engine rpms higher before launching. This is preferred when the engine is modified, and has a higher peak power band. For a stock engine, as mentioned, 2400 is more than high enough. Another thing to consider is the gears in the rear end. The lower the gears (higher numerically), the higher you want the stall speed to be. A mildly modified engine with 4.10 gears in the rear end should have a stall speed no lower than 2800.
Take care,
-Chris
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