I didn't really read the whole article till just know. Yes. Makes sense. It was for a W-2, but who knows whT machine work was done? And what is angle head milling?
Angle milling removes more material from the head surface towards the intake...raises compression but also straightens the air path into the engine.
Mopar small blocks have 18 degree heads. By angle milling you can lower that number a couple degrees. In my dirt world 9 to 13 degrees is the ticket.