I'm going with 123. Practice will not help.... unless you take some advice. The wind was changed to moderate for the 1st round. That resulted in some 12 and 13mph crosswinds, headwinds, etc. My ball ended up in places it has never been in Oakmont, and the result was 34 putts (4 3-putts, I haven't had one in weeks), and several long birdie attempts that are usually from much closer. A 74 to open for me, and I qualified with 64.
This is my advice, and it will only be helpful on the par 4's and 5's. Set up your practice rounds with moderate wind, and try to put your tee shots ( and 2nd on the par 5's) in the range where you would normally end up. Then hit your approaches from there and see what the wind is going to do.