R33's have 2 types of CAS as well. The very late R33, I think mid 1997 onwards had the R34 style CAS.
Alot of people get caught buying Tomie Poncams for their 1995,1996 series 2 R33's and order what Tomie call series 2 cams, which only fit the 1997 onwards engines. When they caome to fit the cams,they find out the CAS is different.
At a guess, the series 1 stagea's may vary as well depending on what year your car is. Pay to check before ordering new cams.
If you want 350-400hp atw, go the Gt3076 .82 IW.
Mine arrived yesterday. Most guys are getting around 270rwkw at 16psi and upto 330rwkw on high boost.