Eddy vs Holley CFM ratings?

318willrun said

And how many times are people told they better get a 500 cfm for their 318...... when mother mopar put 800 cfm TQ's on them. I've ran 750 Holley double pumpers on them and had them run great. I have a 670 Holley on my 318 right now and it performs awesome.

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OK, but a TQ has that adjustable flapper, and "just sayin" you might have found that even though it seemed great with a 750, it might have run better with a 700 or even 650.

Isn't a 670 a vacuum secondary? They are much more forgiving than a DP