Welcome:hello:
Is it the car in your sig?
Things I could think of off the top of my head.
PCM (might need swap or programming)
transmission master cylinder
new piece for the shifter on the console
shifter
crossmember
New pedals
You may have to drill new holes for the pedals and shifter, but I'm not sure.
I did the opposite swap in a 91 camaro. It wasn't too bad, but wasn't fun either.