How are your rotors? Front rotors take most of the load. They usually wear faster and can warp. I have a wheel shimmy as well on my 83. I balanced my tires and it helped but still shimmy. So I checked out my brakes/rotors/suspension. Guess what? My shimmy is caused by a stuck front left inside caliper piston. Thats right, the PO never changed the brake fluid. As we all know brake fluid attrackes moisture. This means eventual rust. My caliper piston was "fronzen" and was always applying force to the inside of the rotor. With heat and time this caused a slight warp. Be sure to check your caliper pistons and rotor runout before you drive yourself crazy on tires/wheels suspension.
Good luck!
