Salt water went into places that can never be reached and treated, like inside the chassis rails, inside the doors and rockers- it's going to get cancer in all those places.
It will never be worth more than half of what an unflooded one is worth, so the fact that it's kind of a high-dollar ride doesn't really work in your favor.
It took a big depreciation hit because it will never be a vehicle that wasn't underwater.
If it was worth 80K before, it will be worth 40K after it's rebuilt. The interior wood will be swelled up and discolored, probably delaminated in places, carpeting and upholstery ruined, the wiring harnesses, rebuilding the mechanicals like the trans and rear-end and all the engine electricals, starter, alternator, etc. Exterior paint and trim, new inverters and batteries and so on, ad infinitum.
There is no way to come out on something like that if you ask me- even if you don't factor in your time you will sink a ton of money into a project that can never be worth what it was worth before the restoration.