How many miles are on it? Is it just tired and worn out, or is it in pretty good shape? Also, have you given it a good tune up? Points, plugs, condensor, wires, cap and rotor will help more than you realize.
If that isn't enough, you might check into upgrading the ignition. A Petronix ignitor or Langdon's mini HEI will help. Also dual exhausts are always a plus.
