You just got great advise from a guy with 3 posts, well said Bates. I have owned a 1984 300ZX NA since new in Feb of 1984, yes, I am old
. To add turbo there is a big lift, it can be done but you'll need to find a donor car to take a bunch of parts.
What I did to mine is 1) have it running 100% power, 2) cold air intake, 3) cat back exhaust, 4) Bilstein or KYB shocks/struts 4) Eibhach or similar lower springs, 4) bigger sway bars front and rear, 5) front strut brace bar 6) add kick butt stereo, 6) bigger sticky tires with new rims...that will get you a fun to drive car. Yes, you can do turbo conversion, but honestly if that is your goal find another Turbo and sell this one, it will not be worth the expense and pain. believe me in my 35 years of ownership I have weighted all the choices, it just isn't worth it.