How to get my car into 12 seconds?

It,ll be fairly hard to get in the 12,s without spending some dough on the 360.You have to find out what year the motor is,and maybe pull a head to see if it,s stock(pistons)or a rebuilt motor.I have a 2500 stall I,m gonna sell,that has about 600 miles on it.(904).Atleast start with a compression test on all cylinders.Good Luck.