how to get 340 into 12,s

mmmm hi guys changed the springs in the msd and then retuned it ,went from not being able to spinning the tyres to frying them and mounting the curb and buckling a front rim and busting 3 tyres,this thing dead set hammers ,its gone ballistic i think this was definetly the problem ,12 sec timeslips coming up this weekend at mopar sunday !!!!!!!!!!!!!!!