904 transmission shift issues...

I have a Chiltons Barracuda & Challenger 1965-1972 Repair and Tune-Up Guide. ISBN 0-8019-5807-5. It has good pictures and instructions, for all the styles. It looks like 1968-1972 \6 had the same linkage design. The bell crank is bolted to the exhaust manifold. It looks like the throttle is mounted above the kick-down rod at the carb.
I have only worked with the common stud type.

The 1966 linkage looks nice to me since a single operating rod at carb. However the accelerator pedal has a rod, not a cable so will likely not install well in the 71'. It might be possible to use the 66' bellcrank at manifold, and set it up to work with the throttle cable.

P.S. It looks like you can buy the book on amazon from $5 to $265 (new) :)