Where is all common leak sources possible on a 65 904?

I've got this 65 Valiant slant six with a torqueflite that leaks just sitting. It's only driven occassionally because of this leak and not far. It has those annoying shift cables. It's the column mounted shifter. Within the last year I've changed filter, pan gasket, removed and reinstalled shift cable, speedometer gear, park cable and park cable cover gasket. If you fill it up to specs and drive it around it will do good. Then if you don't drive it again for a week or two and start it up then the fluid is below the add mark. So it's leaking out just sitting. Where is all the leak sources? I've brake cleaned it all off to try and pinpoint but can't track down mainly because I don't know all the leak sources besides front pump seal, rear seal, and pan gasket. Which all appear to be dry. The leak seems to be originating from the driver's side middle area of the transmission. I was just wondering what other seals could be failing there?