There's not much reason to take the pans off and clean them. Extra time and effort and could lead to unexpected problems and leakage.
Do you know why it has been sitting? They all "ran when parked" but there must be a reason.
Some simple things that you can do are to open the fuel line between the fuel filter and the rail and see if there's liquid fuel in it. See if it smells like gasoline or sweet kerosene. Or Pine Sol. If it's dry or the fuel is orange-red and smells funny the injectors could be gummed up. If it smells like gasoline they'll probably be okay. After you check the fuel tank for rust and old fuel, refill it with fresh gasoline then run the fuel pump to push the old fuel out of the rail and injectors and get it diluted with good new fuel. Or break the return line back by the tank and push the old fuel out.
Check that the breaker plate in the distributor isn't rusted. If it is the bearing cage will probably break when vacuum is applied on the first engine start. Lube it up before starting.
Pop the valve cover and see how much rust is under there. Condensation can produce a lot of moisture over time. If there's rust then one of the oils with zinc additive might be a good idea. Many people don't use it after break-in but better to be safe. Valvoline VR-1 is popular. I think that NAPA carries it.
Check the air filter housing and intake tubing for mice nests. It's one of their favorite spots, besides the air vents in the cabin.
Squirt some oil in the cylinders through the plug holes and let it coat the rings before spinning the engine. Some of the valves are always open when the engine is stopped so there will be at least two cylinders with some surface rust on the bores.