Question About Late Leveling on a Priest

Hello. I’m currently level 50, playing a dwarf priest. I’m shadow spec right now for the faster solo leveling. However, I plan on respecing to heal for late game dungeons/raids. I like min maxing, so I had a couple questions:Would you guys recommend I respec now? And focus on getting gear from grinding dungeons.Or should I keep solo leveling as shadow until 60, before focusing on pre-raid BiS?Also - When I do respec for healing, how would you recommend I distribute my points to be the best possible raid priest?Thanks ahead of time!! IGN: Zalathor Server: Ashkandi