Quick suggestion; when you place your order for the two gaskets ($11 each) you should also buy a new set of valve cover grommets. I think there are 16 total. They are rounded metal washers with rubbers seals molded in. You'll find the rubber to be brittle when you pull the screws out. Some of the grommets will stick to the valve cover, others will just come apart. You'll be happy you had new ones on hand for the re-install.
Also, you may want to buy the two S-shaped crankcase ventilation hoses while you're at it. If you've never replaced them, they are also lkely to be hard and will crack when you remove them to replace your plugs. You probably knew this already, but just in case...
John
www.utahracing.com/supras/john.html