There were a variety of carbs offered on the non-pumped engines including Perry carbs. Perry carbs were also used on the pumped engines but were a larger bore I believe and a couple of different ones were offered.
http://www.mecoa.com/kb/ is the present manufacturer and "authority" these days and could help you sort out the engine if it comes down to that point.
Current Perry pumps and carbs can be found at http://www.perrypumps.com/prod01.htm