My humble advice would be to live with the car / drive it round for a while and she will talk to you!
You may end up buying all the bits and then deciding to change the colour and have to take it all off again! Or you may drive and find that you want to sort out the mechanical side first / extract more power and that would take your time and resources.
Make a list of all the items you need, take your time and don’t just part with cash as soon as you see parts come up. Try to get a feel for quality and prices and ask this forum, as people are often very decent at parting with hard to find items at a reasonable price.
I personally really like that green - especially of it’s fresh paint that is done well. If you plan to regularly use the car you’ll probably want to refresh the paintwork in 10 years anyway
Read up on the mods - it doesn’t take a lot to extract the first few extra ponies: better leads, properly gapped plugs, electronic dizzy, coil, decent header /exhaust, well tuned carbs / Mix / timing, setting valve lash, loosing emissions kit etc. If you want to go further, then welcome to the rabbit hole of modified engines that you can pour your pension contributions into
. Let’s face it, you won’t be enjoying it when your hip goes and your back hurts so you may as well cash the pension now!!
For example, my modified L28 engine built by experts (and not me!!), while producing about 78% more BHP than the one that I replaced, keeps the 70s soul of the car but turns the volume up on the enjoyment factor, without being a handful. There are others that run 300 or more BHP with turbos and engine swaps - but I feel that’s probably not where you are going.
One of the things of love about the Z scene is that most of these cars were modified very early in their lives and no two cars are the same. There is of course a place for the hallowed stock / concourse cars that you wouldn’t dream of hooning around a track or country roads!