I've played a fairbit in the engine bay of a 85 Hiace and I found it a bit tight even with an inline 4 in there. Working around a V6 would be a bit of a pain. It can be done, but you might have to think pretty carefully about where stuff will sit, especially on the passenger side.
Unsure of the T5, but the Celica box won't work with column shift. You need a box with shift linkages sticking out the side to connect to the column shift. Most boxes out of cars have the shifter coming straight out of the top. But does the van currently have a box in it? If so then it will be a G52 (from memory) which is internally the same as a W5* (Supra 5 speed) box, in other words plenty strong enough.
Hen
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