I designed an interesting kit for the z31 front suspension that I'm convinced would do wonders for the rear of the early datsuns...
I've seen how seriously involved installing rear coilovers are, cutting out the strut tower top to weld in a new camber plate; what if you didn't have to do that? What if you could adjust camber at the spindle, and what if you could maintain that camber under compression (like a hard launch)? What if this would allow you to interchange/upgrade your coilover later, say to Fortuneauto 510's, Apexi N1 Revolution, Tein SuperDrift, or other premium brands?
To quote Scotty: Would that be worth something to ya laddy?