670. All the carbs I have tried seem to have a leak or something.Yes that method works,and a lot of those adapters leak.That won't fix your idle circut being too rich though.What size Holley Street Avenger carb are you using?
Will check that. Checked it. Seemed kinda tight so I adjusted to about .08 and no change. Sprayed some carb cleaner around suspect area and no change. Fungle!What is the gap during idle for the excellerator pump? More times than i could count a rich idle is accellerator pump to tight. Go for 0.07-0.10 gap. When you find the leak ill bet money your idle air screws will need to be set out 1 1/4 +- 1/4 turn.