Safe RPM for a 408" Magnum?

I had my EFI tuner bump up the stock ECM rev-limiter by 500 rpm, because sometimes it hitting the factory rev-limiter just before my modified 200R4 would shift into 2nd at wide open throttle. I believe he told me the factory rev limit is 6100 rpm, and the trans should shift just above that rpm and before the new RPM limit is reached. I just reflashed it last night and have yet to test it.

The motor has a mild hydraulic roller (214 & 218 @ .050"), a balanced mid-compression Hughes reciprocating assembly with cast crank, I-beams and hypereutectic pistons. The heads are Hughes CNC Super-prep'd Eddies with some additional hand work in the bowls and ports. The oiling system consists of a blueprinted standard volume pump, windage tray and 7 quart pan.

It seems to me that the bottom end should be easily able to handle these moderate rpm's even though the motor is definitely nosing over somewhere in the high 5000 rpm range. Once it shifts into 2nd, it lands the rpm's in the peak power band.

Any information or experience with these motors and rpm limits would be appreciated.