Oil Pan replacement oil pump mounting question

Hi guys,
I finally got around to replacing my oil pan on my 360 in the cuda, and had a question. I had to drop the oil pump to change the pickup, when I go to re-install how do I make sure the pump is properly seated to the shaft. I had a problem years ago when I replaced a pump on my 340 and it wasn't matched up. Want to make sure I don't have to do the job twice like I did last time :) I was thinking I could use something to hold some oil and crank it to make sure it pulls. Just wanted to see if there were any other ideas. Thanks.