BigJase, Basically you considering exactly what I was going to do with it - put it in my B110 for racing.
Whilst nothing is out of the question, I desided that was going to be a big (& expensive) job, The SR16, SR18 & SR20 are all different blocks hence you would have to have a gear box specially built, then there is the induction system and any major changes to this and you talking a computer as well.
An SR16 is probably best transplanted into a light weight front drive car.
Sorry to put a damper on you idea - but i was a good one, after all I had the same idea. he he