901 Gearbox

[cormac163]

I am going to do a 5 speed conversion in the midst of a subaru conversion. Does the 901 use the Type 1 flywheel as the Subaru uses a modified vw flywheel will it fit.
Also how far or does the 901 box move the engine to the back of the car. If so how much by?
After considering if I should do it or not I have just bought the box AND I dont care too much about the fit I have read that it is a 3cm push back which make no difference as the rear valance will have to be removable and I can shave a bit more off....cant I?
thanks

Cormac