never had a cam put in a motor. how would i go about jettin the carb for the cam? im goin to rebuild the carb this weekend and wanna change the jets while im at it. so anybody know some good sizes that would work in a 350 with a 274 lift duration 4x4 comp cam? i know how to put them in im just not sure what sizes i should use. should i jet it up,down, just leave it???? i dunno what sizes are in the carb now but the secondary hanger says O and needles say D R.