Putting the Getrag transaxle on a SBC/BBC or LSx is really pretty common at this point. Mating a Japanese engine to an American trans, I would think, is not so common.
Most likely you'd have to get a special adapter that will bolt your LS T56 bell to the Evo engine, not a special bellhousing. The Getrag bell is bolted to an adapter and that is bolted to the LSx
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