I'd like to set the open loop fuel mixture on my distributor and was refering to the Steve Brotherton article in the DIY section. He states that -3ma is slightly rich. I'd like to have a slightly rich open loop mixture for WOT and cold start operation. Is -3ma ideal?

How do I get the correct measurement. I have my multimeter "amp" port connected to the black wire at the plug and my multimeter "common" port connected to the brown wire at the plug. With this set up will -3ma reflect a slightly rich open loop mixture?

Also I checked the altenator brushes and found that they protrude about 1/4" from their holder. Is this acceptable or should they be replaced?

Thanks
Jorg