I personally drop a car to lower the center of gravity for cornering and handling (aka turning it into a TransAm racer). I stiffen the springs by doubling the stock spring rate so that the suspension has little to no give at low speeds. I didn't stick to the engine size restrictions in the rule book though. Like Smokey Yunik I never looked at rules as a restriction, but more as a guide.
If you ever saw one of my cars you would know I don't do it for looks as they often have different colored sheet metal parts and I never wash the car. It does corner like a slot car and accelerate like a rocket.
Compared to the Millennium Falcon it didn't look like much, but it could embarrass a lot of the cars I met which annoyed those who bought their SS, Boss, Hemi toys at the dealership.