As you say, the Herald/Vitesse rear suspension uses shims at the chassis end of the radius arms.
I set mine up with a bit of toe in at the back to give stability at speed and adjusted the front to have a fair bit of toe out to give agility. I've never taken mine anywhere near an alignment rig, I just set the whole thing up by trial and error until I liked the handling characteristics, just like real racing drivers do.
The reason I mentioned setting the back suspension up before aligning the wheelarches is that one of the rear radius arms on my donor was set to give toe out (it appeared that someone had welded in replacement rear outrigger at a jaunty angle) while the other had a lot of toe in (ultimate drift car setup?) and the wheels moved about half an inch each when I set it up properly. That would have altered the 'fit' of the wheels in the arches if I'd modified them to fit round the wheels.
I'm sure yours will be fine though...
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