On the later f7r meganes (i think) the drive shafts are exactly the same length. I've noticed this on the 182 as well.
They have a fixed shaft going from the diff (drivers side) to just behind the engine block, then the cv joint/drive shaft coming out from this. Resulting in it being the same length as the passenger side.
I've heard this is to help prevent torque steer and thus give better handling.
I'm guessing this mod could be done quite easily on the williams. As far as I can tell the housing is bolted to the back of the engine. If the later(?) meganes had this set up, then a 714 (or even 710) block should be able to provide this? Or perhaps there is even provision on the 700 block?
Worth it?