That’s why I sent you a PM. The math I use doesn’t ask for airflow.
It doesn’t use intake flow, exhaust flow or the ratio between the two.
What the equation does use is bore, stroke, compression ratio, rod to stroke ratio, and for the intake lobe it wants rpm where you want peak torque.
Based on that number (intake duration) you calculate the exhaust lobe, the LSA and the ICL.
I’ve been using it for awhile now and if your engine is over square and the rod to stroke ratio is relatively high you end up with a single pattern cam IF the rpm is fairly low. Like 6k and under.
As the rpm goes up then you get a split.
I’ve checked lots of combinations and I’ve yet to see it call out anything with a 4 degree split.
I think the least split was for my W2 engine and it was 9 degrees.
I’ve seen as high as 14 but that was a 632 I ran the numbers for.