More details as I remember them....passenger rear footwell will need repair, rest of the floor is good....odd.

Wooops, too many 66s around here, just hit the 6 key out of habit. I'd correct the heading if i could figure out how. As for the 12 bolt four link diff, that's a common thing in six cylinder cars, at least around these parts. In fact I've found over the years way more three link ten bolts behind 283 cars than six cylinder biscaynes and strato chiefs. I'll post pics when it stops raining.

see2xu wrote:

---

 And there wouldn't be a 12-bolt behind a stovebolt.

---

 As Cheviac states, that's one of the quirks of Canadian Pontiacs, the 6 cylinder 12 bolt oddity. My uncle ordered a brand new 65 Laurentian, 6 w/3 on the tree and a posi. It came with a 12 bolt!

Some Canadian Cutlasses around 68-69 also had the 6 cylinder/12 bolt combo.