I have read that manual secondary carbs can be used on cars if they fit into a certain catagory, that being less than 3100 pounds, manual tranny or a high stall converter, and with gears no lower than 3.91's. Since my Duster fits this catagory, should I consider maybe purchasing a manual secondary carb? Can the vacuum secondary carb I have (either a 670 Street Avenger or a Holley 3310) be set up to work just as well?

I'm not very carb savvy, so any help is greatly appreciated!

TIA!!!