I have a 1970 Coupe deVille and trying to determine if the vehicle is equipped with the model year option of Automatic Level Control. Any suggestions on how to determine this?

Check to see if you have an air pump in the engine, if you do then you have that option, there should be an airline coming out of it.

I believe theres even a tank under your hood. It would be located by the fenderwell bracing by the brake booster.

There should be a valve on the rear axle that determines the car's level. There should also be a vacuum pump with hoses under the hood. When it works, it makes a pumping noise.

You will also have air shocks in the rear. Black rubber boots around the shock body. If they've been removed, then look for plastic air lines close to the shocks.