Wow, for a 336W that stock actually looks pretty nice. All of the ones I see seem to look more like the gun pictured on the academy ad. Yours looks darker and has better grain than the ones I have looked at in past (when I first saw your picture, the forend almost looked like the laminate stock on my 336BL).
Congrats on what looks to be a pretty nice 336. For $359, I'm actually thinking about picking one up as well - for a spare. I have a few Marlins of Remington manufacture and have not had any real issues. In fact the issues I did have were with the later production JM Marlins that I bought.