The value is in a running vehicle. You buy it, you fix it, and hope to make money...or, you fix it, drive it, and enjoy it.
I ain't sure the carbs are worth that much...maybe...all depends on what someone will actually pay for them.
You need to get it home, clean up the fuel system, lube the cylinders, change the oil and filter, crank it for oil pressure (and fuel flow) with no plugs, then check for spark, clean up the carbs enough to make them function, and see if it will light off.
It's gonna smoke until you burn the oil out....then should clean up. Watch the temperature and look for coolant leaks.
Exhaust may have reverted to iron oxide by now.As long as it isn't pointing at a fuel tank or fuel line, you're okay for a while.
Check trans level while running (stick should tell you running or not, park or neutral), add as necessary with the correct stuff.
Chock the wheels, drop in in drive..does it load up? Try reverse..does it load up?
Re-check the trans level.
Stay away from the electrics as much as possible for now, other than fuel pump and distributor. You need to find out if it runs, clanks, rod through the sump, if the trans works...THEN you get it titled up, get an exhaust, brakes, tyres, lights, power windows, AC. Let me know this time next year how you're doing with it!
(joke)
Exhaust, calipers, master, pads, turn rotors, hoses, booster, carbs, fuel pump, radiator and heater hoses, coolant, oil and filter, belts, battery, fuel tank remove, clean, inspect, oh, five grand more? You do all the work, maybe three.