dont put the lucas in last. make it the 3 or 4 th qt you dump in, then top off with your new tranny fluid. 24 oz is large, thats 2 qts.
i get up to 6 qts in there, then fire it up and see where the level is, they can take anywhere from 6 to 8 qt to re fill. depends on how long its open and dripping dry on ya.
also go get some used cardboard boxes to lay under the car, the odds of making a mess are there, cardboard can keep you from a ass whoopin, either from dad or the wife, pick one for your situation lol