I finally got everything taken care of. It turned out to be a burned exhaust valve on #3 with #5 not far behind it. Ended up replacing both of those valves and re-lapping the other 4. She's now hitting on all six again and running like a top. I'm guessing that the larger hole in the restrictor tube was allowing too much oil to the lash adjusters and ended up holding those valves open a little bit causing them to get too hot and eventually burn up. Hopefully, the new restrictor that I made will fix this going forward.
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