walbro carb

hey, i have a hf 49cc cag
currently i have a v-stack, uni air filter and rocket key.
i am looking for a carb at this point. specifically a walbro because i only have $60 to spend......i was looking at the wyk-58 barrel carb but some1 told me it wouldnt work or fit with my v-stack is this true? and if it is can you recommend me a good efficient carb thats in my price range and would fit...also if this carb would fit is it easy to tune and reccomend it???......

thanks