67-9 small block power steering pump source

Trying to help a friend in our local Mopar club install power steering on her 67 Dart. Car has a 340 with the cast iron water pump (and driver side lower radiator hose) with mounting for PS pump. It is a Thompson/TRW pump. Is there a source for a rebuilt pump with reservoir? Is there a conversion kit to a more readily available pump (Saginaw?)?