I have ran several different carbs. and intakes on my Duster with no choke, six pak, 850 DP, BG 850 no choke, and several different Holley 1050 Dominator carbs. with no chokes. I do modify the idle and transitions circuits to lean them out but as already said once you get it tune righ it takes two or three half pumps on the accelerator circuit and keep at or above 1200 RPM until you get a little heat in the motor and it will idle Make sure the mechanical advance in the ditributor is shorten up so you can have between 16 and 20 degrees advance at idle an 34 to 38 degrres total advance at or above 3000 RPM and you should be good