Why even change those shocks??? No, they may not be the "holy grail gold" shocks, but they are what came on it. And they are pretty easy to get parts for too. They were used on the Lazer, the Maxxum FF, apparently the Mid Custom, and a handful of other cars too. Those look to be in awesome shape. If the plan it to try running it some, I would at most replace the o-rings and oil, and try them out. I "think" they have pressure bladders on top. Those would probably need replacing too.
With any vintage car you, especially if you are going for shelf queen status, get it in your hands and asses what it needs BEFORE replacing original parts.
Yes, you can find cheap chinesium shocks that will fit on there. But not ones that will look like the original Kyosho quality shocks. Even the Duratrax Gold shocks of the day, while visualy almost indistinguishable from Kyosho Golds, were not up to the task.
I see a handful of ugly radios. And a bent manual speed controller bracket. The vintage ones are, meh. If one works set it aside and save it, maybe. The FLySky is not really worth running either. Grab a GTC3, cheap and good. And it is hackable too. The 2 will work, but the 3 has a lot more features for under $50.
Looking closer at the shocks, those might not be the same ones Kyosho used on the Maxxum FF... Those had a cool quickly adjustable step stop for the spring. I will have to go out into the shop and look at my examples.
Wheels... Figure out what diameter you want to run, I would personally stick with the original size. (I "think" those are going to be 2.2") Hop on eBay and search for "Kyosho Wheels" and see what pops up. The Lazer ZX runs the same type/style of wheels, sorta. The ones you have are actualy harder to find. SAVE THEM. You can find solid dish faces for cheap though. If your not running the original tires, I think proline actualy sells wheels with tires mounted already in a similar style.
If you are putting the older Mid style body on it (the one shown on the manual covers, I personally hate the Custom Bubble body you have), then the earlier style Optima Mid wheels same size front and rear, would look just as good. There is a seller on eBay right now selling some seriously awesome buy one (pair) get one Proline tire deals.
Again, save all the OE stuff, probably even the ugly beat up body.
