Airflow to Cubic Inches
Is there an ideal airflow to cubic inches?
Or is the most airflow a head can flow more desired?
Your question, probably unknown to you, but, is a loaded question. Let me see if this helps in a general fashion. Of course, this general answer may not fit what your thinking since the variables are always moving until a set plan is laid out and executed.
The easier an engine breaths the more power it will make. This works for a factory passenger car designed for grand-ma to go to the grocery store and church with up to top fuel.
No matter the engine size or performance level sought, it’s hard to feed an engine enough air in and out. There is a point where there is to much cylinder head. This is t a fixed size or number. I’d say this would be fairly obvious that a top fuel head on an otherwise factory built engine is too much. But where this balance comes in and where the, “OPS! Went to far!” Is, again, a variable dependent on engine size and performance.
Formulas and the math will point you to a certain criteria to look for in a head. Memeber @PHR has a bunch of B/RB experience. His suggestions are worthy to take note of.
All in all, you probably can’t get to much head on top of a 493 unless you go extreme.