i just recently picked up a 89gt. its bone stock nothing done to it all. it also an aod trans. what would i have to do to make the car run low to high 12's. i already have a set of 373 gears need to be installed and bought bbk shorty headers and o/r h pipe and flow master mufflers. what else needs to be done to make my goal work? any advice is appriated thank you..