Congrats on the car! It will be a nice driver or weekend cruiser for you! As far as value, well, it's just another factory production car that was a performance model...nothing more, nothing less. Of course, all the filters should be changed, fuel definitely needs to be removed (guaranteed varnish), I would add 1 oz per gallon of acetone to the fresh fuel..... this will not hurt the cats, etc. but it will re-liquify/clean the fuel system of any varnish that may have formed in the injectors, pump, etc...….it will raise the octane a tad too as well..... clean the intake (BG Products makes a very good intake cleaner) and I think I would add some marvel mystery oil to the engine oil....it will not hurt any of the components but again, it will liquify/clean (slowly) and gum/varnish that might have formed.
and an fyi...from a guy who has stored many a car for short and long term....
Prior to starting the 1st time, pull the plugs, and give each cylinder a little shot of wd40, then with the plugs our, just spin the engine over until oil pressure shows (either psi or oil light goes out. You now know that the cylinder walls are lubricated and all the bearings have oil. Also, it's not unusual for an engine to run a bit rough up to 2 weeks when they have been sitting that long...but all will be fine after it get's fully loosened up.
Good luck and enjoy!
Member: Never trust a person over 40 who drives a Chevy club
Flatheads ain't so bad!
Certified backyard mechanic I & II