The old style body is a better one to use, but the HP is OK. If your idle bleeds are .028 or .034 you have an issue, it's likely the main air bleeds that small. The main or high speed air bleeds are closest to the vent tubes, the middle are the intermediate, the outer are idle. A 9375 comes with .034 mains, .063 intermediate, and .053 idle.
Now for a suggestion on calibration, there are things you can do to make it much better if you can handle drilling and tapping small holes, the link below provides that info. To make it usable as is with a good cleaning, put .026 in the main air bleeds, take the intermediate air bleeds out and leave them out. You can try go up .002 on the idle air to .055. If it makes the transition too lean, light throttle surge or stumble,you can go back to .053. If the idle mixture screws end up between 1 1/4 to 1 1/2 out for best idle the idle/transition fuel metering is usually close. 93 square jets with no power valves will be a safe starting point with this calibration, jet for best MPH from there.
http://motorsportsvillage.com/forum/...php?f=6&t=3742
