For that engine, your choice is fine. It only needs a bit of ZDDP to make it happy and keep it running strong. It is a flat tappet engine, but not a high RPM race motor. The amount of ZDDP in that oil is plenty good enough.
Oil brands is sort of a can of worms, there is a lot of opinions about them. Could still be fun to hear if someone has had bad experience or very good experience with that oil. Or if someone else is using Kendall oils.