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ASE Certified Master Machinist
1967 Chevrolet Biscayne 10-71 blown 433 Big Block Chevy, T400 & 12 bolt 3.73 rearend
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That depends on quite a few different variables. The heads, cam, compression ratio, rpm range, engine size, etc., all have an effect on how much horsepower will be increased. As a general rule of thumb though, a 30-50% increase is possible.
More info is needed to give a better answer.

Barry
 

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Agreed. There is no way to say. You didn't even give an engine size. Engine size and type of fuel will be two MAJOR factors. 40-60% power increase can be easily had and more if you do the work.
 
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