here is link http://www.skylinesaustralia.com/forums/topic/395232-394kw-1994-r33-gtst-act/ he said he has run up to 30 psi
yes i dynamic CR is less with big cams ( every cam changes it)
was thinking of running camtech 268 dur ,9mm lift in (with VCT) and 272dur 10.4mm lift
and yes for my HD