Distribution block ports?

Not a TCP firewall question. Heh.

I bought this distribution block from Inline tube:

1962-64 Mopar A B C-Body Dual-Reservoir Master Cylinder Conversion Distribution Blockdistblock.png

But I have no idea which ports are which. No diagram came with the part. I sent a message to them but received no response. Nothing in the service manual. Looked around here and BBD and did an image search but came up with nothing. What a damn nuisance.