You’ve got several simultaneous misconceptions going on… from zinc being what an oil needs, to using a zddp additive. You’re always safer using a fully-formulated oil to protect your engine rather than playing backyard chemist.
There are several oils available that will protect even flat-tappet cams without ever needing anything “extra” than what the oil blender put in the container. Amsoil Z-Rod, HPL CK-4 are two great choices. As shown by others, the M1 FS 0w40 is more than capable as well.
Like I said, they are all snake oil except the one that passes the seasonal feelings test here... Check back in a few years and there will be some other take on this.
M1 0W40 has so many different formulations in different markets and changes so often here in the states that I wouldn't assume anything with it. Their paperwork on the product is also full of contradictions.