I like DV's overall concept, start with LSA and overlap, but I don't if I'd trust it a 100%, one it mainly comes from testing Chev's not saying there's no crossover, 2nd it's based on valve size instead of a heads capability cause he said more know their valve size over flow numbers, but a huge difference between Eg. stock and fully ported 2.02, 3rd Richard Holdener did 108 vs 112 vs 120 on same cam spec couldn't get a 116 on time, 108 had the best curve, 112 not too far off, 120 had a decent loss. I know it was only one test. I don't know if there's a magic formula but I think it gets you in the ballpark. Generally like carbs we kind of knows what works from what's has been working overtime.