turner I suggest you sell it. The car will decay sitting around. As far as the injectors it sounds like with you hardle use style you just need the stock OEM replacement injectors. But note the 1990 Z32 came with the old style pintle injectors that fail. If you replace them you need to upgrade to the new style 93+ pintleless injectors by Nissan that handle the E fuel better. That upgrade requires a different fuel rail or adapters to mate the new style injectors to the lower manifold plus new electric connectors.
This is not an easy job. Most standard shops will keep it simple and put in the original old style injectors charge $$$ and send you on your way. Don't do that. You either need to do it yourself or find a dedicated mechanic that knows these cars.
If you are going to do the injectors I recommend you do all 6. Cost will be around $1000 - $1200 in parts if you do it yourself and around $2500 for a shop.