internally, if something was going to let go, it probably would have done it already, chances are you've had it up to 4k at least on the street, its only another 1500 rpm to 5500 (i'm guessing where you would shift an LT1, i don't know). racing on a dragstrip is only slightly harder on equipment than merging onto a highway.
And if something that you built broke, that means you need to build it better next time
