Hi, my name is***** do you mean by "tune"? Are you looking for a performance upgrade or just a basic tune up?
As far as the fuel and ignition systems go there is really nothing you can do to increase the performance aside from advancing the ignition timing. You can put a free flowing exhaust system on the car. That would make the biggest difference. I have never seen any performance camshafts offered for this motor. Oversized pistons would increase the performance but then you are getting into some major engine work.