Watched 1st Two Vids.
Not Bad.
Has stock rocker arms. Aftermarket Crower stainless steel Enduro 1.6- 1.65 :1 likely would have hit 400 HP.
Made over 1 HP per cubic inch with heads design dating back to 1964 Olds 330 ci V8.
Better Carb like a Holley HP series with adjustable air bleeds help too.
BLP Bo Laws Race Holley 4bbl be a piece of cake.
They hold up amazing great in real world Olds V8.
Take a beating like few others can.