Lowering is probably the first thing comes up when fixing up these old trucks. You want to go low, so research Must II vs Mono leaf, dropped axle, dropped spindles and subframes. Keep in mind that smaller wheels, tires require that old motor to produce more RPM's to keep up with traffic. On my 53 3100 I tried 15" wheels, removed couple of leafs from the front, 2" lowering blocks in back, and "short" schackles all around. Note: if you remove to many leafs the front will bottom out. My concern about removing leafs is that the remaining springs will be "safe". Last but not least, during all this you will want to pay close attention to the wheel bearings, kingpins, drag link, tie rods, brakes, and steering!!! In the end you want a truck thats fun to drive not scarry.