[Henry S]

I believe the rule book does state this clearly, I was told once that the rule book states only what yo can do and all else is not permitted. The bold text in the general reg identifies the ruling. Under general reg 4:5 GROUND CLEARANCE A-Arm Upright 4:4 Minimum 3 inches from front of car to 12 inches behind centerline of front axle; 2 inches for remainder of car, except oil pan and exhaust headers where permitted. When permitted under Class Requirements, devices used for anti-rotation purposes (i.e., wheelie bars) are exempt from the 2-inch clearance rule. Unless otherwise permitted by Class Requirements, the installation of a ?beam breaker? in front of the body is restricted to extending no farther forward than the body or bumper and must also satisfy the 3-inch ground-clearance requirement.

In the stock section of the rule book:
BODY Alterations or customizing prohibited; extent of customizing is limited to paint only. Convertible-top cars must run with top up. Sedan delivery, Ranchero, El Camino, etc. (if found properly classified in the Classification Guide) are eligible only if all class requirements are met. Raising and/or lowering front or rear of cars prohibited. Cars must retain level attitude at standstill, except those that have a forward rake (a permitted modification). Bottom of rocker panel cannot be higher than centerline of rear axle. Body mount insulators may be replaced with solid mounts of same size. Aluminum or other lightweight material may not be used to replace heavier items on car. In front-wheel-drive vehicles, air dams and spoilers that were available through the manufacturer are permitted front and rear. This is pretty clear that it is not legal.