May I inquire into your oiling system. What does it take to keep the rod bearings alive in your set up. I lost #7 on my 340 some years ago. After it was rebuilt it survived plenty of 6700 rpm pulls street racing, yet I lacked confidence in camming it up more. Surely your spinning your combination up far higher than I did, and I would like to have confidence in getting into the mid 7000 rpm range.