Real deal or move along?

I've seen that list posted here and over at big block molars, but the problem for me is that it starts (for a bodies) at 1966, and I'm trying to confirm information for 1964.

Perhaps during the process of swapping my axle I could take measurements of my stock axle and contribute to the common knowledge.

That still leaves me with the questions I asked in my original post.

So measure the axle? The jpeg says it’s the same as the later cars. But that jpeg is wrong about a ton of those measurements, so that’s not really a help. Bad information is worse than misinformation.

All of the swaps I’ve heard of use an A body 8 3/4 and I haven’t heard of any crazy backspaces being needed. Probably a little more than a 67+ A, but with stock spring locations the 67+ A’s typically use zero to low offset wheels. There are people that have done that swap on this board, I’m sure a search in the early A section would turn something up