I had to tilt the transmission when installing it and had some fluid loss. Hard to tell how much when it's soaked up In paper towels.

When I had everything back together I checked the fluid level via the stick. I added 1 quart and after wiping (with a piece of leather chamois) the fluid was just over the bottom hash mark. I think that's the cold mark. I idled with the parking brake on and selected all gears for a few seconds each and checked the level again. The level was again on the bottom hash mark but in either direction the car would barely move. After cusing a lot and posting the question I idled in each gear for a full 5 seconds several times over. This finally got the fluid circulating and reading low on the stick. After almost 4 quarts the level stopped dropping and I could do a full test drive.