I've been thinking the stock carb, but am open to aftermarket as well. I am not trying to make a screamer, but if there's a reasonably priced option I'm open to that. My thoughts are clearance in the frame, keeping the carb level (Is it necessary? The engine will be at about 15 degrees tilted forward), and ditching the stock air filter setup for an aftermarket one (for clearance and looks). I will also have to ditch the muffler for some sort of pipe/muffler combo routed back through the frame, again for clearance reasons.