Sorry to bring this back from the dead, but I took a closer look at the pitman arm. I found a number cast into it that shows to be for a 73+ B-body. Am I correct in assuming the 66-72 pitman arms dont interchange with the 73-79s geometry wise?

1969 Nova
454/M21/3.31
Mild mid-11 second weekend cruiser

1994 F150 XLT Super Cab 2WD
5.0/4R70W/3.55
(Daily driver)