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If you can, the Subaru boxer engines are flat, aren't they? Or an air-cooled VW, although not very FE.
For a solution on mounting the engine lower, a dry-sump pan will let you lower the engine significantly. It may be costly, but it also reduces parasitic drag from the crank splashing in the oil, and you can use an electric oil pump, further reducing working HP required to turn the engine.
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