[rich b]

I would think it would be too wide.

I guess I would look for '37-'40 rear, don't think there is any real shortage of them; yet.

You would need to grind a straight '37-'40 spring to fit your crossmember, easier than redoing the spring mounts.

If you are looking at the '47 because of the ratio, buy it and switch the center section into a '37-'40.