I *guess* you could just make the hole bigger where theres power cable. I'm not 100% sure, good person to ask might be FRISKI as he's done heaps of installs on R33s and no doubt done quite a few power wires n stuff thru the firewall....
Yeah it's off of a 300ZX, alchemist is correct in reccomending this. If you search the General and Performance forums you will find a fair amount of information on this, as well as RB20DET/R32 GTS-t power upgrades and stuff =)
meggala this is also why i am waiting (apart from the fact i;ve gotta save some $, and wait til i can get a loan)
can choose from 1988 and 1989 models =)
prob wont be til around mid next year until i buy anything, for now its just investigating