650 or 750 holley

my 360 picked up big time on the low and hi end with a well tuned 750 dp over the well tuned 600 dp. over 5k rpms i was starting to pull 2.5 to 3" vac which is a sure sign that my 360 need more cfm, even at 3k it was pulling 1.5"s this is in a 420hp 360