Answering my own question:
Front Left = V1 = Left Output
Rear Left = V2 = Left Input
Rear Right = V3 = Right Input
Front Right = V4 = Right Output
I started tube rolling last night. I have been listening to a set of NOS Brimar's for about a year. They sound great, just a little on the warm side of neutral.
I picked up a pair of 1966 Amperex Holland (labeled Electrohrome) and installed in V1/V4. Brimar's are still in V2/V3. The Amperex appear to have about 2db more gain. The soundstage really opened up, it's much more 3D than the quad of Brimar's. Vocals (both male and female) sounded breathy and fantastic. Everything sounds more lively and I really like this combination.
I have a pair of military Mullard's and a quad of Telefunken's being delivered soon, so I'll try a few more configurations and post my results.