Do me a favor, neighbor. With the drive belts on the car, pull on one. Do you see the crank pulley/Harmonic/dampener move at all? If yes, remove the SC belt, and start the car. Still hear the clank? (Don't do this on a warm engine, do it cold, and not for long, because that'* your water pump belt also).
It still sounds very much like a Harmonic to me. I have the same problem on my 95, and I'm replacing it today.
If it is the SC, it would indicate that the bearings are shot, allowing something to hit, but it might also mean that if it'* been doing this, the SC may not be worth rebuilding. Replacement rotors and gears cannot be purchased.
I'll also warn you that doing a FULL rebuild on the SC is possible, but a real challenge. You really have to know your ****, and you'll need specialty pullers and hydraulic presses. Ultimately, for most owners, www.canadiansupercharger.com
may be the best option, but let'* rule out that crank pulley first. Your hard starts are pointing this direction. The interruptor rings that tell your crank sensor when to fire your ignition and fuel pulses is on the crank pulley.