Cam swap without pulling motor

Lunati recommends about 350 lbs over the nose for this cam @ 0.454/0.475 intake/exhaust lift. What is the danger zone for stock stamped steel rockers? I was talking with a Mopar performance parts supplier today and he suggested that 250 lbs was about the max for stock rockers. What say y'all? I have punched a pushrod through a rocker on one occasion.

Now that I think about it, 350 may be a little high. I know it's more than 250 though. I need to go back and check the specs, but the question remains - what is max for stock rocker?

I found the specs. Looks like 300-305 over the nose.