PQIA runs tests on oils from time to time.
Here is Rotella T4 from March 2017.
PETROLEUM QUALITY INSTITUTE OF AMERICA TEST PROGRAM
I run this in both my valiant and corvette fuelie.
My guess is 450 500. Very similar build to mine in the valiant. And yes, I have weld in frame connectors. Interested in your dyno results. I have not done mine.