That's a perfect length for that draw weight but I would do 1 3/4"-2" wide just for safety but I have made lots of bows in that weight range from hickory over the years and most were between 66"-69", but for a 27 inch draw 67" is more than long enough. Like they said make sure its dry or it will take set really bad, and also heat tempering the belly goes a long way on hickory and I have added a full 7 pounds to a bow just by heat treating the belly, 10+ if I force it into a reflex at the same time I heat treat.