The question is how much power do you want to make and at what rpm do you want peak torque and hp to be attained at?
Basically with any motor when where talking airflow levels at a 28" depression you will need 4 Intake cfm for every 1 hp you want to make per cylinder.
Really well worked out and thought out combos can make 1 hp per cylinder with just 3.59 cfm at the rpm of peak hp.
Also you need a certain amount of minimum port area also to hit your rpm goals of peak torque and hp and the Cam you pick and it's centerline and overlap also is a big factor in this.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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