Yes, I'd just look for another stock replacement carb that is in better shape than the one you have. They are everwhere out there.
If you reallly want a bigger carb, get a Keihin PWK 28mm. They are also plentiful, pretty straightforward to tune, and the flat side design improves throttle response slightly. You can use an aftermarket 'TORS Eliminator' throttle cable meant for a stock Blaster carb with the Keihin carb.
The 28mm PWK carb will also fit into a stock Blaster intake manifold, and you can usually heat and stretch the airbox boot as well and make it fit. I:I