..727 trans is wider so the z bar is about an inch shorter.The 904 can be 'forced into place and will work but it is better to make a couple of witness marks,cut an inch out and re-weld.
the trans bracket for the z bar is lower but you can install the 904 bracket under the trans tab and it will sit level
the shift and kickdown linkages usually have enough adjustment to work.
the carb to trans lever on the intake mounts higher on a 4bbl intake and is longer and these parts are avail.
Hard to find a column shifted 727 in an A body..