Danny here's how I did mine. I took a 5' piece of aluminum square tubing and jacked it up against the keel of the boat, along that flat spot. Then I tilted the engine so the cavitation plate was parallel to the tubing. I then clamped a piece of 3/4" square wood to the bottom of the plate to get my measurement, In this case it was 3/8"....not good!
After I installed the jack plate I did the same measurement process. And then screwed the jack plate up to where the cavitation plate is 2" above the keel.
Please notice how ugly my engine's lower unit is compared to yours. That's 12 years of being run hard and too poor to buy another one.
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