My 1960-64 MPC (printed 1969) lists
60-64 Bird c6oz-6675-a
60-64 Ford c6az-6675-a
Obviously replacement numbers but the point is theyre NOT the same. What's different? Don't know.
My 1963 MPC only iists parts for A=Ford, not S=Bird.
The big Ford pan back then was almost a quart deeper than the later "unibody" pan, and totally unbaffled - just a crank scraper that hits with a longer crank, BTDT. This big deep pan later became the truck pan.
Was there a deep Bird pan too that was different? Apparently but I don't know the differences.
And it looks like 1958-59 had a different pan again.
The Unibody pan are shallower, seems the big Gal used them too though slight differences.