323 GT is also cable actuated (identical to an XR2 tranny). You could use it with an XR2 pedal assembly. Its the stronger transmission, the axles are different, however the N/A axles *may* work providing the splinecount is correct. The pass axle might not clip into the diff which could be a problem, as the GT and XR2 use a jackshaft on that side instead of a full length axle. It could clip in no problem I'm not sure.
I know the clutch is different though, the disk is larger but I dont know if the input shaft and splinecount are the same