As some one else said, any oil is superior to what was available then.
no, a LOT of engines ( not just Buicks ) lost a lot of cams back when zinc / ZDDP first got taken out of the formulations. primarily newly assembled engines with new cams that hadn't yet been through a run-in period. there was a whole big fooforaw when this first started happening because the engine builders had no idea what was going on. they were just getting cam lobes wiped all over the place.
they've figured out work arounds for this now. be SURE to follow all install req's and read the instruction sheet if installing a cam, mostly plentiful application of Break In Lube.
modern oils are 'superior' at not burning up your catalytic convertor. lubrication is a secondary consideration for the current recipe.
The way to crush the bourgeoisie is to grind them between the millstones of taxation and inflation.
Vladimir Lenin
Government schooling is about "the perfect organization of the hive."
H.H. Goddard, Human Efficiency (1920)
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