Finally got the 2bbl carb setup properly on my 54 p/u. Carb is off a amc 258.stock intake and exhaust and a gm250 hei dist.thing scoots along very nice. Smooth idle with the hei and nice response with the carb.ran a 1bbl carter for years nice carb esp with hei dist. But I like the 2bbl better it is a carter s well.