30wt in summer?

[67chevy_hotrod]

Well I just finished my cam break in cycle it's been about 500 ish miles so it's time to change the oil. I picked up some valvoline 30wt and Lucas zddp additive. Got home and thought to myself why did I buy this weight oil? I never have before and I never see anyone else buy it. Well I figured it would be ok seeing how we are coming into the summer months and we won't drop below 50 (most likely) and the only new component( as crucial as it is) is the cam. I was thinking this viscosity might hurt the cam on those occasionally colder mornings.. Any thoughts? Should I just run 10w-30? Also is there any oil out there that's like the old stuff with zinc still in it that isn't crazy expensive? Thanks