Opinion on oil

Looking for opinions on oil viscosity on Gen 3 Hemis and maybe people's experience. I am currently putting a 2012 Ram 5.7 together and stock it required 5w20 and since I will not be running mds and may not be vvt I was wondering if I could use a 10 w 30 or 5w30 full synthetic. I always used Mobile 1 or Valvolin Vr1 . Also I was wanting to know if a Zink additive would be useful in a roller cam engine.