Question Re: Barracuda ('68) Rear Folding Seat
One thing that can happen is that cams can come loose from the rod and the rod shifts in the end-to-end direction, causing the other cam to jam. I had this issue. I pulled the seatback for access, then recentered and tightened everything. When bolting the seatback back down, there is a lot of leeway in the bolts, so it can shift left, right and up, down. This alignment is also pretty critical, so you might need to loosen the bolts and shift it around a little.