Cant see a T50 lasting too long with a 3SGTE either way
However, IIRC, 'Truenotch' runs his AE86 + 3SGE this way, and it has been that way for ages without problems.
(Unless he's got a custom bellhousing? But pretty sure engine and box are tipped)
Either way, I dont think it's so critical with a manual box, doesnt really have a sump like an auto one does?