There’s not going to be any cheaping out on this if you want even a half-decent restoration. If the car runs and drives well and is not eaten up by rust weevils then an interior re-do and some paint and body may make it acceptable.
If this car has the retractable hardtop and it’s not operating a small fortune can be spent on servicing that because (memory fuzzy here) this system uses something like 30+ operating motors to get everything moving in the right direction.
You did not provide info about the condition of the car but you have to make a decision based on one of two things.
If you’re looking to do this just to turn around and try and make money on a resale it’s a lost cause more than likely.
If you have a genuine attachment to the car you have to be prepared to possibly spend more money than the car is worth and consider it a love affair investment.
Follow those TV auctions like Barrett-Jackson and you’ll see cars going over the block all of the time in which the cost of restoring or building that car far exceeds whatever it brings at auction.