Just dashes will restore the dash pad to original condition. The process takes several weeks after they receive your core. The cost begins at $1200, It can go higher.

This dash I believe has a french seam around the forward edge and can be recreated in shop for a lot less.

It does not have the french seam or I would have covered it myself. It is a molded vinyl/plastic one piece cover. Just dashes finished price with shipping and color match is closer to $1,500 with a 5 month lead time. Just wondering if there were other options.

If it needs to be stock / non custom Just Dashes is your best option. You could try to patch, grain and dye. I have not attempted this myself as of yet, but it is possible depending on how bad the damage is, and how much time you are willing to spend experimenting.

I have used this plastic repair material and it works great but I will be wrapping the dash, and not trying to grain and paint/dye. I used this to fill large holes, cracks, and even to fill the center speaker which I'm eliminating https://www.semproducts.com/product/dual-mixtm-multi-plastic-repair-material then I used this Polyflex as the final filler, to smooth everything out.

I have not used this but it looks promising. https://www.polyvance.com/280Z-Dashboard-Repair/ though this wont give you the correct grain.

I have used the dash repair material by Polyvance on several dash repairs, it works great, but it just fills/repairs the foam portion and have always recovered the dash after the repair. Make sure that is well stirred before mixing the two parts.

I do vinyl repairs, but this one has been done by someone else. Quite poorly I might add. So repair is pretty much out of the equation.
It looks like Just Dash is the only option as a junk yard wants $1,000 for a 60 year old one.