~450hp from stock stroke 340?

I’m going to start this post out by saying myself personally I would never run a hydraulic roller cam. But some guys are doing so successfully and going fast doing so. My buddy’s son has an app 3200 pound duster and runs 6.60’s-6.70’s with his 408. He punishes this engine double entering and going lots of rounds winning lots of races. Not sure what his secret is but it can be done.