I know, at one point, that V8 A bodies used a dropped center link and slant A bodies did not. At some point they commonized on the V8 one, not sure when that happened though. I want to say it was in 73, because when I swapped a 360 into my 72 Dart to replace the slant I believe I changed out the center link as well, but that was in 93, so I might be misremembering.

So I went digging into the parts manuals, 1966 is th last year that my manuals call out a different center link for a 6 or and 8, so you should be good.