Wow, must be hard to guess at the rest -
Assuming you have some area of "squish" above the piston to generate swirl? Flathead is such a different animal -
I never thought about it much tho I learned on Model "A" and Ford 221/239 - there's kind of a second intake port - the piston has to pull across the "bridge" to the intake valve, then thru the intake valve itself. So the cross-section of that "bridge" between the piston & intake valve has to stay big enough that it doesnt restrict -
