I was given a socket 370 ISA SBC and I'm a bit out of my element here, I cannot find a single case that the backplane for said SBC would fit in and still leave all the PCI slots usable.

I was told that it would fit in an ATX case but that would leave 6 of the 12 slots unusable so obviously that's not correct.

This is the backplane.

Any help here would be greatly appreciated.