Re: New model carb- Improved?
look in the classic posts I have the size of drill bit to use and sort of how to drill the main jet if yo ugo too big it's a simple matter of soldering it shut and redrilling it so you really can't go wrong be sure to deburr the drilled hole with a over sized bit held in your hand and lightly twist it on the hole you drilled. My post on this will be on the #2 page I think.
I think its better to use what you have than spending money on a carb that might not work any better than what you have. If you run into problems give me a PM and I'll help you out.