Bow definitely made by Gary Davis. 3-D means that there are 3 layers of deer (whitetail) sinew. I recognize the bow and believe that I hunted with Gary while he carried this bow.
As for the arrows, Dale Gray is a barber in Flint, MI. I don't know him but my friend Bob gets his hair cut by Dale. Years ago Mr. Gray's barbershop was also an archery shop. He still sells arrows from the shop. The style and cut of the feathers look just Dale's style. I would bet that they were made by him. Don't know about back then but, currently Dale gets between $25-$35 per arrow with a stone point.