The increase in CR will definitely help make more power. But you will have to run race gas.
The look from that intake, imo, is small plenum and short runners. You said no taper. That is a higher rpm intake. With the small plenum, it probably needs more carb than you have.
The cam just doesn't seem to match the combo to me. You said you had to advance it 8 degrees for cranking compression. But did you run it on the dyno to see the power differences?
With the intake being limited, etc and the displacement of the engine I think you need a bigger spread and a fair bit more duration to get good cylinder fill. That and a larger carb and the increase in CR should get you smilin ear to ear.
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68 Firebird
Are you running with the wind or breaking it?
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