The DR30 has a similar design to the 1600 and Bluebird as far as i know, heaps of dynamic camber and bump steer.
I enquired to Benson about putting a R32-4 rear end in. And it needs to still be a semi trailing rear end, as it needs to be the same 'type' (live axle, semi trailing, multilink). With the rules you can fix it, but it will need a bit of thought and designing. E30 bimmers, and the 911 RS's seem to be fine with semi trailing.