I agree about the Mahle Powerpak kits being a great value, we use 50-60 sets a year. A lot of the BBC offerings are still 1.5,1.5,3.0mm packages, still better than the 1/16, 3/16 stuff. They are slowly changing everything to 1.0,1.0, 2.0mm, most of the small block bores are there.This is 2020, no need to use 25+ year old technology.
I'd use and .043/.043/3mm STD oil ring.
Use a quality steel top and steel Napier second ring.
Check out Mahle power pack piston kits, baddass setup for the money.
Just my opinion.