So Many Rabbit Holes...

The 65-67 B body 8 3/4 is one inch wider than an A body axle.
It's the closest fit there is without cutting and welding.

The F/M/J 8 1/4 is IIRC not quite an inch wider than the 65-67 B.
It's the next closest fit for an A.

E body is significantly wider, almost as wide as 71-74 B or C body!