carbs: More or less? Tell me why.....

Looking at crate engines.

a) Ford Racing 351 stroker, 427 cubic inches 535 hp, tested with 700cfm Holley carb. (or so im told by their tech department that the figures achieved during tests were with a simgle 700cfm carb)
Ford Racing Performance Parts - [Part Details]

b) Edlebrock 347 stroker, 449 hp, uses 2x 500 cfm carburetors.
Edelbrock.com - Crate Engines - Small-Block Ford - Performer RPM Dual-Quad 9.9:1 (449 HP & 417 TQ)

Now my question is why does an engine producing less power need more carburetion? Correct me if im wrong but doenst more power consume more fuel/air?

Ford Racing said an 800cfm was too parge for thier 427 crate, no larger than a 750 carburetor should be used for best results. So why does the less powerful 347 use 2 carbs for a total of 1000cfm flow? I could understand it if the engine was producing more power and thus would consume more air/fuel, but wouldnt the 427 actually use more to produce its power than the 347?

Hopefully someone can explain this to me.

Yes I know. I was curious as to why and engine producing that amount of power would require 2x500cfm carbs when the engine producing some 55 more hp (at minumum) more required only 1 750cfm.

I love the was a tri-carb set up, but the price tag is too much for me, Ill go single Holley 4bbl