Correction: The Duntov cam was the 097 cam which had right at 0.4" lift. He actually made the previous cam just a little bit smaller so it would rev better.

The 30-30 cam, while mistakenly called a Duntov, wasn't designed by Zora. it had something like 252 duration at 50 and had gross lift of 0.485 which turned into 0.455 after the lash was subtracted.

If you care to read about Chevy cams, this article lays it out nicely. https://www.enginelabs.com/engine-tech/cam-valvetrain/duntov-small-block-camshaft/

I was deep into chevies back in the day and back then nobody called the 30-30 cam a Duntov anything. For many people's money, the Chevy cam to use in something less than a nearly race engine was the 3863151 cam, the 350 horse 327 hydraulic cam. Mine cost me $38 plus tax at Rydell Chevrolet in Grand Forks.

R.