Yep,
"A" compounds they were......

I'm sure it takes a really smooth driver, and a well tuned suspension,with great shocks to not over-use the tires with un-needed motion or slippage..... Not sure how its gonna work on an archaic setup like an early Z... But if my R6s are going off before 20 laps, I'm sure it'll be a challenge to get 10 laps on even softer tires.....

My source is saying it can be done, and has used em for couple years now....I just hadn't noticed....