Just some facts having owned one myself, turbo's can be swapped without the engine being taken out if u have a hoist (disco Garrett disco potatoe's bolt straight on) but you will max out injector at around 18psi which makes it expencive getting some good injectors I had blitz 880's which were $1300. Internals are strong as are the gearboxes and diff's R200 diff and box is the same one used in the r33's, the breaks are good even better with some slotter slightly bigger rotors on there and if you do the exhaust (twin system) you'll be laughing.
The intake plenum is good for quite some HP but you can do a single plenum aka z33 topsecret style and go big single TB (90mm) the stock brick intercoolers are also pretty decent but you might want to do a nice front mount if you want one.
But having said all this I'm now in a 32 but would like to get another 300zx for cruising, not huge numbers or anything like that just a daily driver that can handle a good squirt every now and then.