Ryan Blaney’s nickname might be YRB — “Young Ryan Blaney” — but the 27-year-old NASCAR driver is actually something like a grizzled outdoorsman. He spent Thursday morning chopping trees for firewood while donning a Paul Bunyan-like beard. “I think (race) preparation is very important, but I think overthinking can sometimes be hurtful to you,” Blaney said Thursday. He’s gearing up for a cutoff…