Jimm, without knowing your cam design this is a tough one. I would say that there would be the most improvement in the low to midrange (30-45HP) due to the increased flow speed with a mild gain up top (10-25HP). This is a real stab in the dark though.
“She may not look like much, but she's got it where it counts, kid. I've made a lot of special modifications myself.”
— Han Solo