What engine oil do you prefer,??.

I need to change my oil in my B-Cudas, and I know I need oil with ZDDP, cause of the flat tappet cams. My 67 Coupe has a hipo 273 with solid lifters, my 69 has a mild built 340, with Hyd lifters. Needless to say I want the engines to last. So give me some good ideas of what oils you guys are using, along with good filters. I ran out of my supply of "OLD" Valvoline 20W50. I have some Hughes Engines oil addative, with ZDDP. What do you use.

barracudadave67