You have more there to be found.I would expect at least 150 more H.P. from that combination.were getting that much with a 420 cu.in. SB2.2 small block at the wheels on a dynojet chassis dyno through a quick change. can you post your dyno chart so we can see what the problem may be? the 110 octane fuel could be a big part of the problem if you couldn't run the amount of advance necessary. Bill