The only thing I can think of is to find someone to build an adapter plate using countersink bolts to fasten the plate to the engine.
Mike

Whats wrong with using a tried and true Briggs, or a Tecumseh? I've seen and owned lots of them with either of those engines on them. I've sold them with American made engines. The only time i had one come in for repairs, was one that the owner forgot to check the oil! And of course, even a mighty Honda won't run long with no oil in the crank-case!