Well it is too late to go out and buy a Cobra now, so the point is moot.
Blakbeard has been running close to 400 RWHP without major issue for over 4 years now on his stock bottom end 2V. With his block being built he should be seeing over 500 RWHP. Angus was at that HP level, but he was making a sick amount of torque.
Angus build your bottom end and boost the shit out of it.
Yup, +4 years and still running strong (knocks on wood). I don't think it's uncommon to make it that long on the stock bottom end. The only reason I'm swapping mine out is because I want to make more power.