WTB mopar A-body 73-76 Power Steering Shaft
This is for the OP...
You'll have plenty of problem using the 73 pitman arm with a 67-72 centerlink, they aren't compatible.
If using the 73 pitman, you need to get the 73-76 centerlink and idler arm.
PSSSSSSTTTT.... you can extend/shorten the steering shaft you currently have.