I have a NEO head on RB30 bottom end, running HKS 272 / 9.35 cams.
Im using the the R33 CAS with the cams, as its in a R33 4 door with power fc. Like Adriano said, they are a smaller combustion chamber with VCT on the inlet only, not that Im using it. As for stricnynel0s, dont stress too much about the VCT as RB26's dont use it and they make enough power with out it :-)