Odds are the car will start on the old gas, top performance? Probably not. Cars in storage draw moisture. I live in northeast Ohio, the temps over winter vary greatly. Sixty miles from lake Erie with lots of humidity. I've seen days where the garage floor gets really wet. So do yourself a big favor, pull the drums, peel back the edge of the wheel cylinder boots, just a bit at the bottom. If they're dry, you're good, any fluid and you've got a problem. Nothing worse than ruining a good set of brakes shoes with leaking fluid. Worse, you blow a cylinder and have an accident. Check the fluid in the master as others have stated. I pour a little oil down the carb, leave it set for a day then crank it a few rotations with the coil wire off. Dry starts are bad, upper cylinder lubrication is a good thing. I have a 70 Mach1 351C. It's near impossible to pull plugs and squirt the cylinders. So down the carb it goes. Basically a safety check is in order, fluids, tire pressures, belts hoses, Once you're up and running, put a little heat in the brakes BEFORE you need them. Sometimes aged brakes will pull the first few stops. Check your emergency brake. As someone else stated, oil doesn't age, it just gets contaminated with use. Any moisture is cooked out at full operating temp. Use a little sense the first few miles, then do your thing. Enjoy.