I just took two of those trannys to the scrap yard (alum tail and side cover). One was from a 73 cuda (a real cuda, 318 3spd) and the other was a 318 3spd road runner with a bench seat. I remember the shifter in the road runner sitting pretty high up in the boot. I still have the shifter, extension and linkage here somewhere, now I gotta go look at it when I get off work tomorrow.