I started with the 850,it was running fine, no bogs or anything. I think it was a velocity issue. I worked with the carbs just to the point of working correctly. Didn't change jets, or squirters, so I think there was more in it there. Just my opinion, but I don't think you need a huge carb on a BB Mopar. Tried changing from a Torker 2 to an eddy rpm, but have never made it back to the track.