This is not an easy question given your location. Northern ponds are different than southern ponds as to stocking LMB and BG WRT timing. You may be in the middle region. Because LMB mostly spawn at 1 yr old in the south and at 2 yrs old up north the timing can be different. A corollary is BG tend to stunt up north more than in the south so letting BG get to far out in front of the LMB is a concern.
My best guess is to use 6 inch LMB this fall (Sept) and only stock 75. You want those LMB to be this years hatch not 2 year old fish.
Here is the MO manual. See pg 64-65
https://mdc.mo.gov/resource/missouri-pond-handbook 
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