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You have many options. All of the two cylinder Johnson or Evinrude, 20 hp, 25 hp, 30 hp powerheads from about 1979 to 2000 or so, (plus the 35 hp from 1979 to 1985, when the HP rating changed from driveshaft to propshaft)(making the 35 a 30 hp).These powerheads will all interchange. While there are some minor differences, mostly in the parts bolted to the engine block, to modify hp to what is rated, (heads, intake manifold, reed stop differences, carburetor venturi size changes, etc), plus a very few internal tweaks to make starting easier or tweak mid rpm operation, the basic engines are virtually identical, are interchangeable and can be modified up or down in power with stock parts. These 31.5 cu inch motors are as tough as they come.