MRL Performance 340, WOW!

Come on now, I can not give you all my secrets. Some things just have to stay in my shop.

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Yup. I anticipated that response and totally understand. I'm also fairly sure there's the biggest "secret" or I wouldn't have asked...lol. There's a LOT of power to be found in a mopar by addressing ring design, setup, and wall finish. Especially given the tall compression height pistons the factory displacements have.
With you chosing not to share I'm with the "put it in a car and run it down the track" guys because it's not really difficult to make a lot of power on a dyno. Put it in a chassis and lets see how she goes.