gas carburetor water cooled 1hp 4 cycle

I just bought this engine, missing parts. I don't know what kind of carburetor will fit nor what the 3 offices are coming out of the top (head) are for 1 carburetor 1/4" pipe threes 1 exhaust & the one in the middle? also there are 2 offices midsection I think may be for water cooling? HELP