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going by the intake, it came off a rotary engine. probably 12a. still has the omp lines attached to it. now if it's actually jetted to run on a rotary is anyone's guess. can't tell by how the fuel inlet is positioned the letters cast into that cover.
Looks like a Mikuni. I don't know much about them besides it can be run on a rotary. If you plan on using it you should take it apart and give it a thorough cleaning based on the looks of it. Also check out the jets and see if it needs rejetting.