Lowering my 1967 ???

[ecgate]

Im getting ready to do a complete restoration on my 67. I would like to know how low i can lower the truck with out doing major modifications like removing the front fenders, putting and air bag system in it or have to mess with the steering system a whole lot. . I would like to put 18's or 20's on it also. What is a good combo with 18's or 20's. Is it 4" drop in the front and a 5" drop in the back ect....... I will be putting disc brakes on it. Any info would be great or some pics of what some of you guys have done.