R31 IRS models are 4 stud - you'll need the 5 stud hubs from a turbo Z31 300ZX. Which are bloody rare!
As for the fronts, if the hubs are semi floating type (like the R31 passage etc w/ removable rotor) just a stimple re-drilling and you'll have 5 stud.
If you're going to use the R32 4 pots, you'll need new offset wheels. If you're going to 5 stud all around, rims shouldn't be a problem.. just get anything from a turbo R32, and you're laughing! They're the perfect offset/fit for a Bluebird.
off topic here, I noticed you said you had a Bluebird.. check out my website if you're keen - www.910bluebird.com - now has a web gallery + a forum (shameless plug)