You will need to make a custom driveshaft with the rear flange from the toyota drive shaft and the slip yoke to your gm trans. The toyota pinion will not mate to the gm drive shaft and the gm pinion will not fit in the toyota housing. If you were willing to travel as far as chicago, I can sell you everything you will need including the 4.3 LSD all from california so it's completely rust free.
The (stock) torsen diff was only used in jza70 supras, i think. Clutch type are much more common and pretty easy to rebuild if needed.
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