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Replace the dizzy cap and rotor if you haven't yet, and the wires as well (that way your whole ignition system is up to par) and fuel filter as well. Basically a full tune up. That should at least help a little if you haven't ever changed any of them/don't know when they last were changed.
Double check your fuel lines for leaks/cracks as well. I had the line going to my fuel filter loose and never really noticed it until I started getting terrible gas mileage.
And yeah 20 degrees is correct base timing for a KA (turbo SR is 15)
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