You' re block lasted two years or so right? These guys think 850whp on a stock block will last 100k miles plus track/street abuse. My stock block owed me nothing as I beat the piss out of it, and I think you made a similar comment as well. 850whp on stock internals @ 7k rpm won't last. Being that I'm on my second L&M motor, I will tell you the tuner and engine builder have different views of what's "safe"I have the ability drive fast but easy. No slicks or 2-step but driving it out, I ran 800rwhp around 110 passes and too many street races to count, 850rwhp seems like it would not be a stretch. Others with less expirence may have different results.
You may be too conservative, as I'm an extremist. Dont take it personal I mean no insult.