Depending on the service history I would consider getting a major service and a full vehicle health check done by a 350Z specialist and CS comes into that category.
Engine, Gearbox, VLSD, Wheel Bearings, Brakes, Tyres, Suspension, Steering etc will all fall into that category.
Also get them to check the engine gallery gaskets which are prone to failure on the HR and will effect the oil pressure and performance.
The OEM stock CSC is prone to total failure at the most inconvenient time, if it has not been uprated, so keep that in mind.
All this is routine maintenance and once that is all sorted then let the modifications begin.