This is the timing cover you mention.
But, replacing that cover gasket would not fix any smoke issue.
I think the popular "easy" fix is replacing part #11127547058. There are 2 that can be replaced on the engine and each are around $20 if you search
http://www.pelicanparts.com
I did the valve stem seal job myself and it fixed the smoke problem. It took about $800 in tools and parts, and 24 hours of labor.