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Originally Posted by nitrorocket
Anyone notice anything good for stability by lowering or raising the car for real high speeds? I assume lowering would be better, but I would need a wing tunnel to verify. 
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Lower is going to be better, but lowering the car isn't going to be nearly enough to keep it stable. Look at Nascar for some ideas, those front and rear spoilers are there for a reason, along with a very small grill area (just enough to cool the engine). They also start with a much smoother aero shape than a Chevelle.
I'm thinking a front and rear spoiler, closing off some of the grille, lowering the car as much as possible just for starters. Problem will be the spoilers aren't going to look good but you need the front to keep the air from creating lift (along with the reduced air through the grill) and you'll appreciate the rear wing/spoiler for downforce. I am not sure you can get the car stable without them at 200 mph, but I am far from an expert. I just don't see any high speed stock-bodied cars without them.
Jody