Kenny, I fitted the B4 rear end to the cat at the Euros in France in 2005 (don't think Jimmy ever did manage to get a pic despite trying
) I still have the drilled wishbones laying about somewhere!!!
I did it slightly different - in that i drilled the wishbones to mount the shocks behind - as std. Can't remember if i spaced the shock tower back - possibly - either 2 or 2.5mm.
What you will find is that the back of the car will be soooo much more stable - and absolutely planted to the track. To the point of understeer. I had to switch back to std as i was 0.4 per lap slower and couldn't get enough steering.
I also ran AE shocks when running long/stood up. For some reason the car didnt' work on AE shocks when running the shorter shocks layed down, but stoof up it was much better. I also drilled a new hole inside the current inner on the front wishbones - to stand the front shocks up more. This was good, but you have to play around with top mounting points and shock lengths to get it right.