You can choose numbers that are barely acceptable with the mark (*).
I don't need explanations (If you want to explain, you can, though)
I think 1,2,3,5,6,7,8,9,10,11,13 make sense and 4,12 seem barely acceptable.
1.She poured out her troubles to me over a cup of coffee.
2.She poured out her troubles on me over a cup of coffee.
3.She poured her troubles on me over a cup of coffee.
4.She poured her troubles to me over a cup of coffee.
5.She poured her troubles into me over a cup of coffee.
6.She poured her troubles upon me over a cup of coffee.
7.She poured her troubles over me over a cup of coffee.
8.They’ve already poured a lot of time and money into this project.
9.They’ve already poured a lot of time and money in this project.
10.They’ve already poured a lot of time and money upon this project.
11.They’ve already poured a lot of time and money on this project.
12.They’ve already poured a lot of time and money to this project.
13.They’ve already poured a lot of time and money over this project.
There are only two that are ordinary natural English. These are #1 and #8. g.
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There are only two that are ordinary natural English. These are #1 and #8. One or two others, e.g. perhaps #3, may be viable as deliberately "creative" phrasing.
By the way, this is incorrect spacing:
1.She poured out her troubles to me over a cup of coffee.
It should be like this:
1. She poured out her troubles to me over a cup of coffee.