440 Six Pack vacuum reading would you swap power valve

[GrandpaKevin]

Installed new plugs and freshened up the carbs on the 440 Six Pack.
Installed a 6.5 power valve.
The pictures shows my vacuum reading at idle, about 800 rpms.
Should I swap out the power valve? Six Pack folks know what a pain removing carbs are
What size power valve should I go with?
What are the symptoms of too low of a power valve?

Thanks.

[JonH]

No, you have 18" of vacuum. Power valve does not open until vacuum drops below the value. In your case 6.5. so you are good to go.

[Chryco Psycho]

IS it Auto or manual , if auto what is the vacuum idling in gear ?, you need to be 2" lower than that at minimum