You don't need any other adjustable parts. For reference all Group S car in historic run non-adjustable and stock suspension bits except for spring and shocks.
This is true if you are going to track the car regularly but if you are only going on the track once in a blue moon, I would recommend the road Yoko AD08R.
I use Yoko A050 track tyres on my race car and I have AD08 on my road mx-5 and I have taken it onto Philip Island and Sandown and the AD08 does not have the same grip as the track dedicated A050 however I was pleasantly surprised at the level of grip it provides and more importantly how progressive/predictable it is. As with any tyres on the track the key is getting the right pressure recommended for the tyres to make them work.
http://www.yokohama.com.au/Tyres/ADVAN-Neova-AD08.aspx
got both 225/45/16 and 225/50/16
road tyres but pretty good grip on the track, a lot of mx-5 runs these in mx-5 vic club sprints.
https://www.cams.com.au/motor-sport/sport/historics/historic-groups
Sc
Group Sc is for non-turbo charged production sports cars generally manufactured and available in Australia between 1st January 1970 and 31st December 1977 with the inclusion of model run-ons.
You can get the 260Z specification pdf from here
https://www.cams.com.au/motor-sport/sport/historics/logbooks-and-cods/certificate-of-description-log-books/group-s-specifications
Gav,
You are just getting old
For me I like everything (almost): original resto, period correct resto, restomod, crazy race car builds.
This too me is better than putting a push-rod V8 into the Z, at least it will have a Datsun/Nissan heart.