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your article is not a test of over-carbing a 350 at all....
what your test proved is that particular motor parts combo does want more than the 750cfm carb will/can supply at best possible WOT Hg for A/F mix above 6500!
(you gave no details for the build except the intake so I plugged in RPM heads/10.5CR/294 cam/Victor intake/350 chevy into my Desktop Dyno to get just roughly close to your chart HP results and find the motor total cfm for this example)
EX:
750cfm Holley carb
6500rpms=735cfm thru the motor/520HP
7500rpms=782cfm thru the motor/456HP
1150cfm Holley only change
6500rpms=752cfm thru the motor/535HP
7500rpms=807cfm thru the motor/478HP
my $.02
what your article and my example do prove is a particular parts combo may indeed "need" more than 750cfm to make max HP possible
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