Just for measure, my 331 hit 595 rwhp on a 200 shot with a stock block, eagle rods & crank, JE pistons, ARP throughout, balanced and blueprinted on a stock '95 block. I've ran this combo for two seasons and the only thing I've done to it is change the oil and replace head gaskets (I'm not sure which I've done more often). It's held up to anything that I've thrown at it but, of course, YMMV.
BTW, I'm retiring the shortblock from racing and will either sell it sans H/C/I or get a roller and have a nice little street rod. It's been a killer combo but I'd like to keep everything that's inside the motor, well, inside the motor. I do know that I've pushed my luck but then again, if it's built right you can go a lot further than you'd think.