Konig - know what this is?

[Puddleduck]

A new motor has come my way, a racing Konig twin. it has 0322 AGV stamped on the block, and HDR 61550. 550 is repeated on other components. The flywheel has 'KONIG BERLIN 36' cast in. A single anonymous carb, probably konig's home made type, is marked B57 573. If the 0322 is capacity in cc, then this is 19.65 cu.ins, a 'B' class motor - does this make sense? I believe it came off a Swift Big Bee. Will it push my 10ft C/D McCrea 3 pointer ok, or will the boat be too heavy? Don't know yet if it's alky or set up for gas/oil. Any ideas on prop sizes?