Oil to used

I have a 1973 440 in my 68 barracuda has been rebuilt sometime ago what is a good oil to used in it. It has a trw piston 10.5 to 1 and 509 hydraulic cam steel crank with 915 heads on it. I have been using 10w30 Castrol in it is that oil fine to used or do I need some racing oil? My lifters on the driver side front is making a ticking sound someone told me is the oil that I'm using. Is that true or not