spec clutchs are temperamental. I'd suggest Sam at Coastal dyno to do the install on it.. The disc design is that of ones you'd find in 4 cylinder some... teh springs are much beefier though. So they had some issues with springs exploding...
For instance the Spec III that was in my z28 for 2000 miles... the spring exploded out blasting the hell out of everything, oil pan, oil temp sender cut in half, bellhousing, slave cylinder and luckily it didnt blow through the floor board.

Sam doesnt charge a lot either... Because of these Spec issues i'd highly recommend having him do it cuz he has done lots of them with good success.