The Stock SR internals are good until ~450 HP including the crank and bearings. You can increase the cranks safety limit by having it cryo treated, shotpeaned, magnafluxed, etc. But dont ask me which are better as I am going off info from others on this....... The SR will be fine at 350 hp internally with the proper precautions as far as fuel, etc. An engine management system would make it very much safer but it can be done on a reprogramed ECU.

Alan