A week later there was some noise up front and by the time I got to a transmission specialist the damage was done.
There was no oil in the front diff(nada), and the drain plug was in and the gasket was sound.
The idiots had drained two plugs, replaced them and only re- filled the engine sump.

Otherwise the "built" tranny is fine. Got a used one and will use the standard torque converter.
The high-stall converter provides outstanding launches, but I'm thinking about acting my age. Maybe maturity is at hand.
I can have the high-stall checked out, and if anyone wants a reliable way of doing endless launches it will be for sale.
Also, I'll have the extra tranny itself checked out, and it could be for sale as well.
I'll be keeping the front diff.