+1, the 308788 is an excellent cam. However, if you want a bit more at the top end, Chris Witor fitted a version of this cam with higher lift on the inlet valves, code CW3021.
I recently fitted one to my 2.5 litre GT6 conversion and am very impressed. My impression is no loss of bottom end and more power above 4000 rpm. I will be putting the car on a rolling road when the engine has done a few more miles, that should really show how good the cam is.
Nigel