Brett, the gtr plenum was on an r34 gt-t 4dr (if u watch d1, it is the blitz r34 4dr, driven by Ken Nomura)
i just did abit of seraching and found that a plate or spacer would be needed to be made to fit inbetween the plenum and the rb25 head. i have contact someone in perth which does ic piping and ask him if he could possable do it, i will get back to you once i have got my reply.
also i read that the gtr fuel rail, will fit also pefrectly?