There are a million posts on sparkplugs. I use the recomended Autolite plug. WalMart carries them. Fram air filter for the stock intake. Distributor cap and rotor from NAPA if you have one close. Get the good quality, with brass instead of aluminum terminals. Plug wires, dunno. Mine has cheap Autozone wires on it that the previous owned installed just before I bought it. They work, so I've left them alone. If I bought new ones I would get better quality than the cheapest Autozones though.
Just replacing the distributor cap and rotor on mine made it run much smoother. A full tune up should do wonders.