what shifter (mounting) plate did you use?
- transmission (tail shaft mounting bosses)
- shifter (upper shifter arm geometry)
- levers (transmission mounted)
- shifter rods
These are the variables which you need to take into account.
EDIT:
Also if I recall correctly, when pushed, I was told that the inline tube reproduction shifter rods are all based on 1969 GTO parts - I'd wager they have the levers too.