Since its been sitting for so long, pay extra attention to rubber components ( hoses, seals,etc.) with lack of use they will often fail. Not a bad idea to inspect your tires carefully and while your there take a good look at brake lines for leaks and cracks. Then drive the piss out of that Z.
Drop or drain the fuel tank. Don't try to start it with the old fuel in place. Change the fuel filter and get as much out of the fuel line as possible.
Of course you will want to check hoses, drain the radiator and block and refill, replace the battery, and (before you drive it) replace the tires.
Pull the plugs and shoot a bit a bit of oil (not much) into the cylinders. Turn it over with the plugs out to distribute oil in the cylinders and eliminate any extra oil. Do an oil and filter change (consider pre-oiling the filter) and again, without starting it, turn it over for 10-15 seconds times to get oil into the filter and oil passages.
Thanks for all the advice...I did change all fluids,belts upper and lower radiator hose...and yes the tires where dry rotted..so I replace those with '16 350z factory...I did start the girl up but i couldn't get her to stop
.replaced a few brake lines and put stock brake system on the all four corners...still having trouble with the booster and I cant find one..she still up on jack stands..still going thru it all lot of vacuum line and wires broken..speedometer not working and the A/T not shifting