1968 Porsche 912 Question?
 

I have a 1968 912 porsche it has koni performance indepent suspention
it has a 930 porsche spoiler the motor was jsut rebuilt by a porsche shop it has some of the best parts it can in it and it has dellorto dual carbs a 89 prosce front bumper it was jsut resoterd and is painted origanal color new interior new tiers it was given to me by my grandfater i was wondering what it is worth and how could i give it more power and what exhaust GM MDI