The initial fill will depend on the pan used; with a dry trans and a stock pan, pour 6 quarts into the trans (any more can be tossed out the breather) and a quart in the converter.

Make the initial startup in Neutral with the rear wheels free to turn, leave a funnel in the dipstick tube and immediately pour in another 2 quarts after startup. After engine break in, run the trans through all the gears, set the parking brake, then check the level with the dipstick idling in Neutral and adjust as necessary.