Unfortunately there are no bolt on uprated carbs for K10/Pao's. There is not much need unless the exhaust manifold is swapped to something less restrictive. What alot of people do is run motorcycle carbs, usually a set of four in the 400-600CC range. They make a hell of a difference and coupled with a new (custom) exhaust manifold, you'll add around 20-25HP to your Pao!!
I run Cbr 600 carbs on a custom inlet manifold along with a 4 branch mani along with some other bits, the manifold is by far the biggest restriction on the MA engines so id sort an exhaust before yo look at carbs