Hey guys i have a 72 chvelle and i have a 350 with 4- bolt main,stock pistons,mild cam, edelbrock streetmaster intake and a carter afb competition series carb.? my question is what is the correst postion for the idle,fuel, and air screws. i took a spark plug out and i noticed it was a grayish white color. it idles high but when its in drive it idles low and soounds like it going to die. i was going to try to time it but there are no numbers on the harmonic balancer. this car is a relly nice car but the engine is driving me crazy. i'm only 17 and duing all off the work on my own, but i would apperciate all the suggetions and ideas to my questions, thanks for taking the time to read this.