Hey man,
1. You may have a problem using the smallport flywheel on a ZE because of differences in diamter meaning the startermotor wont contact (not 100%) However providing thats ok you should be fine. If you can bolt the smallport clutch onto your ZE flywheel then that also sounds ok...
2. the only other thing to worry about is the t50 gearbox input shaft going into the clutch assembly but im pretty sure that will go in fine because my friend is running a small port block and t-50 gearbox in his ae86...
Just wait for a few other replies cause i may be wrong
3. clutch id recommend DAIKIN / EXEDY heavy duty organic or puck clutches, heaps of ppl here use them including me and theyre fantastic. Your local autopro should be able to sort you out, mine was around $360 (clutch face, heavy duty pressure plate, and thrust bearing)