Bob, thanks for the info. From all I've read the other Bully owners were bench marking their rpm #'s with an 18/10 on average of 7500 to 8k which makes me believe I still have an issue, though Im sure it would spin an 18/8 close to that. I checked the timing and its at about 30deg btc. From what I understand, isnt this about right for an electronic ignition unit? I have my Zenoah's set at about 28btc.
I also found another person who's bully came with the same HDA 21-245 as mine has, so Im not sure when the production changed. After some research I decided to go with the WT 610 as it was one of the carbs that took the place of the WT 540, which was the popular choice to upgrade 3W35's and G38's to. I did change the screen on both carbs, I used the full rebuild kits on both (though the 610 was new), not just the diaphragms and gaskets. I also assaulted them pretty good with cab cleaner and an air compressor. Someone on my original post also mentioned the case might have an air leak where the two halves join, I need to check that. Did yours have this issue?

Also want to say thanks to w8ye for the info. The parts I need for the original carb no one seems to sell. I can get the idle and high speed needles, but I cant get the washers and o-rings which are really the parts I need. Since Ive already spent as much money on the carbs/kits and exhaust as the motor originally cost me, I am hesitant to spend another $50 or more for another carb. Any idea why the 610 will only run through its prime then die? Its getting to the point where if I cant get what I got to work, it may end up a really cool (and expensive) bookend.