this message is to WBEAMS.
Ok i know this may sound a bit stupid, sometimes when you put a new clutch in a vehicle , when you bolt down the pressure plate before you put the trans back in and it feels like the pressure plate is bolted down tight,
well it is not down tight trust me i had the same problem with meine.
what you need to do is park it on a flat surface and then go under the car and remove the inspection cover from the bell housing and then have one person in front of the car with a ratchet and socket on the crankshaft nut and another person in the car holding the clutch down and you under the car with the right sized socket and ratchet and have the one person slowely turn the crankshaft untill you see the bolts and tighten them one at a time, but remember have someone inside the car holding the clutch down while doing this.
I wish you well with your supra.
1985 SUPRA mk2