Okay, since you swapped out engines you don't need to go through the cam break-in procedure. Fill engine oil to spec, fill coolant, and ps fluid as much as possible.
How much fluid did you drain from the transmission? Mine (722.369) takes 7 quarts to change. To refill, I need to add 4 quarts, then start the car and add the rest of the charge one quart at a time. I imagine you'll have to do something similar. The trans fluid should distribute itself soon after startup.
The ps fluid will need to be topped off as soon as possible after the engine starts.
How long has the engine sat idle? Was the engine apart for any work? If it's still wet with oil inside, you may get by without priming the engine oil.
95 E320 Cabriolet, 131K