W40/W50 bellhousings will not fit on the later W5x alloy boxes, so what you want is a box and bellhousing from a later-model car with an M series engine (eg MA61, MZ10 etc). You will probably need to modify the gearbox crossmember as well, I know this is the case when upgrading an RA23 Celica from W50 to W58, but the tailshaft should fit with no mods.
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