1 st im at sea level
motor 421, 4 mil long rod cub, cool head with cc domes, billet one piece intakes, v force 3 reeds , 39 pwks with billet bowls and pods, in frame shearer pipes , and +4 on timing runs on 112 to 114 octane. what should my jetting and timing be at? i mostly run quarter and asphault thanks in advance .