So I flew to Tulsa,OK from Houston, Tx and purchased me a 93 TTZ 5spd with 152k miles for $5800. This is my first twin turbo Z32(I was a proud owner of a 2004 Z33. Just sold her last year)

Anyways, I don't expect a brand new badass car for that price, but I didn't expect the car to be that shitty. Learned my lesson. Never buy a car that isn't local.
So the gearbox is loose. It grinds in 4th (meaning the transmission will be Eff'd up soon). See signs of oil underneath the engine base. The shocks on the suspensions are almost gone. Car runs and drives fine but these problems need to be fixed immediately. This will be my project car and will be kept forever, maybe!

I'm planning to pull the motor and rebuild it myself. I have no experience in pulling any motor before but I'm pretty good at opening and fixing things. It will be tough but its a good project for me.

I'm planning to upgrade the turbos and other parts. My goal is to make my Z to be somewhere in the 500whp. With someone's experience and knowlege, what parts do I need? Like name and size of turbos, injectors, fuel rails, basically I'm looking for a list from owners who have walked my path.
I'm planning to do this since I'm gonna pull the engine and rebuilding it..thought might as well doing the whole nine yard.

Advices with good info are welcomed. I'm estimating my project will take 6 months to a year to finish.

 

I would check out the package on z1motorsports , they have a 600hp (~510whp) package.
While you're in there you may as well also upgrade the cams, springs, 300 degree fuel rails (550cc or 740cc injectors) and exhaust manifolds. Not sure if you'll need to upgrade the fuel pump at that point.
You'll want to upgrade the down pipes, test pipes and exhaust...I would also suggest going with 3" pipes instead of the 2.5". Upgrade the underdrive pulley and pop charger, you may be getting close to needing/wanting dual intakes. Upgrade the clutch and flywheel.

The package I linked to above includes everything you'll "need"... my other suggestions are things you may want to do since you'll have the engine out already and NOW would be the time to do it.

Another (probably better) option would be to call Greg at SpecialtyZ ... He can most defiantly point you in the right direction.

 

What's your budget? I'd say just fix the minor oil leak on the most likely oil pan and buy yourself a decent set of shocks (+springs) or coilovers for it and all other bushings and suspension components that are broken. Swap the spark plugs with brand new NISSAN ones (DO NOT get aftermarket!!!). The 4th gear grind is most likely the sign of your clutch being gone, it's not uncommon, so I'd recommend to swap in a nice new 500lb clutch/plate and resurface the flywheel in there. The tranny is rated for ~750hp so don't count it as dead -- this ain't no mustang, it's a proper car! If the engine has good compression and hits boost properly, don't rush to pull the engine...as it may be a project you never finish. If there's no knocks and the engine still purrs and isn't blowing mountains of smoke, consider yourself lucky. Put some medium-to-heavy oil in there since the seals are very old by now. If it still runs funny, check your injectors and coilpacks...make sure you've got good vacuum and it should be good to go for at least a season! Not to scare you; but the VG32DETT ain't a beginner's motor and working on it takes time and frustration.