What data do you propose to gather in dyno testing? Heads vs heads, intakes vs intakes, camshafts vs camshafts, or cubic inches vs cubic inches? That would determine what shortblock to build in my opinion. A good strong shortblock with compression necessary to stress whatever you want to test is a necessity. I found that out when dyno testing heads, intakes, carburetors, headers, etc., on a Y Block build. The shortblock needs to be as strong as the highest horsepower you want to dyno test. Joe-JDC