I built mine about 10 years ago. It was one of the first so there was a lot of trial and error for me. The first thing I would do contrary to what everyone says is to buy a standalone ecu. I tried the Enthalpy tune with a Z32 maf repeatedly. I tried the Apexi PowerFC LJetro. I finally went with the Power FC DJetro. It is amazing. If I change turbos or have a boost leak, the car runs fine. If I don't start the car for a year, it starts up and runs fine. I recently got it back out after barning it for 5 years.
If you look on here, you will find cheaper ways to build. I used an 84 camaro radiator iirc and a flexalite black magic fan. Both work perfectly. Cooling is important. I also louvered my hood.
The amount you spend is up to you. Most machine shops will shorten and balance a driveshaft for $75. LSD rear ends get expensive. Most items are junk yard sourceable. My first build was a 355 sbc 260Z.
My main suggestion is that if you want a reliable daily driver, get a standalone. I think you can still get the discontinued PowerFC DJetro.
My 280Z is my daily driver again. It has around 400rwhp as I drive it daily on 21 lbs of boost. It averages 33 mpg. At 2480 lbs, I think it will outrun almost any daily driver. Pretty bulletproof setup.