With the increased displacement you will also gain compression. I would say that if you do indeed have 99 octane gas and a cam similar to say a RA4 grind you could make a lot of power. The 16 heads with their small valves will choke your power down to probably 350+. If you go to large valves and do some porting 450 is doable. A ported set of aluminum heads will net even greater power levels (potential 500 or more depending on cam intake exhaust etc.) and also provide greater tolerance to lower octane fuel.
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