Engine trans plant for baja beetle because i changed my mind about the porsche?

well i changed my mind on buying the porsche so im getting a baja beetle for roughly 600 kuwaiti dinars about 2000$ because i already own a an air cooled porsche that i only run in the winter so i found a mint baja beetle 1973 and iwant to get a more powerful water cooled engine for it and the baja is good for transporting my cousins to school and it does fine while driving off road but I aint so sure aabout the cooling so do you know any engines made for the baja beetle that are water cooled or maybean engine from another car?