By correcting shift pattern, are you referring to the shifter indicator? The only solution to that is finding a 4spd shifter plate from a mid 80's cutlass that had a 4spd trans. They are hard to find....
If you are using the original console shifter from your car, you will also need a 4spd shifter bracket that has an extra notch in it, a 2004r cable, and a 2004r cable bracket. Check w/Gbodyparts.com or Dixiemontecarlo.com for those....