I wouldn't pry anything until I've tried a couple things first.
The brake pads may have rusted to the drums (since it sat so long).
Try taking a sludge hammer and tap the wheels or drums a few hard taps to see if they break loose.
Also, driving the car in forward and/or reverse could break them loose too.
Do all of that, if all else fails then I'd try the pry bar but it's likely you'll destroy the drums if you go the pry bar route.
Good luck