If you look at 340 stamped lockers compared to 318 stamped rockers they are all clearanced it that area you have circled. My son has to clearance rockers of all types. We paid $1800 for a set of T&D rockers. Two were fitted to therngine without a clearance problem. After the tear down for refresh we found that several were hitting at the same place as yours. So it doesn't matter what you pay the fitment quality is all the same. Not very good at all. He made a fixture to clearance rockers now and many are very far off.
First pic is of the hit rocker
second pic is of the fixture on a rotary table for correct radius
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