What's this "rack mod" being referred to? Is this the rack plug change? If so, it won't make any difference. The plug doesn't affect rack travel. The stop plate does. Max rack travel is 21 mm on all pumps due the rack stop pin. Once max rack travel is reached, delivery valves are about the only thing that will affect fuel delivery on an otherwise stock pump. As 21 mm of rack travel is approached on the 215 pumps you get into the start-up notch on the plunger head. That will provide more fuel, but usually results in higher EGTs with minimal power improvements.
-Jay
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