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Well if I can remember it's not all NA 89-90 RX7's the 4.30 with LSD was only in the GTUs not the GTU or any other NA model. If you got your hands on the whole differential just swap it, buying the ring & pinion is not that hard if you are mechanically inclined. I'll see if I can find a write up on this for you. Also Mazdatrix sells a 4.77 & 5.12 ring & pinion set if the car is not going to be street driven all that much & top speeds are of no concern. Would be great for drag racing.
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