No, god no. Moto fast is garbage.
Also, full of lies. Moto-fast isn't the only one to win a GNCC on a banshee. Have you heard of Duncan?
If you want a single carb, use a yamaha manifold. If you want good low end, use PT pipes. If you really want a good trail/mx engine, talk to DDQ about his setup. Suspension will be key and take most of your 2500 budget.