A Dart GT showed up today

Perhaps I am mistaken then. It is more than likely a 7.25" rather than the 8.75" as originally stayed. I have a 3.23 742 carrier out of a 66-67 b body. Would that housing fit with a perch relocation?

From your pics it looks like an 8 3/4. No bolts holding on a diff cover. It could of been changed out as the 7 1/4 blew.