Hi marnusn, welcome to the forum.
About your questions:
1. The Type 9 gearbox will fit to the 1UZFE auto bell housing with an adapter plate. I have a drawing of this,
send me your e-mail address as an pm and I'll send you the drawing.
The problem with the Type 9 gearbox is the strength ( or lack of it ), please consider a different gearbox for
your swap, it don't know if the Type 9 will handle a stock engine.
2. The 7.5" diff should be ok, the 7" will be marginal.
3. A stock engine will fit, it's even possible to retain the AC radiator, but anything more than that and the
length of the engine bay limits you to what you can do. If you move the bulkhead 4 to 6 cm back you have
more room to play with.
The pictures show how it fits without any modifications to the bulkhead.
4. It depends. The stock brakes should be fine to stop the car on the street, if you intend to use it on track
you will need bigger brakes.