From what I have found, the LSD on the 2nd gens is a 3.90 ratio. Not that bad, just have to get a transmission with a good ration, and fit some larger diameter tires on.
One reason why I am looking at the RX's is because they are newer, hence less rust prone, while still fairly light weight. Good condition Z's are getting spendy, but a blown 12A 2nd gen is downright affordable.
mobythevan, nice looking swap! I am going out the door right now, but your thread looks to be well illustrated with good progress write ups.