The issues occur at different levels, as you probably know the engine was not designed to handle boost so even with the standard turbo kit which does not include a built motor it may handle life a 1/4 mile at a time but anything more will grenade the motor a lot quicker than expected. There have been consistent failures with the standard kits with owners that race them around the track.
As for the built motors, they will not survive around a track at that power level. Even those that run them at 1/2 events refresh (read:rebuild) the motor every 1-2 years assuming a catastrophic event does not occur before. They also have issues controlling heat at higher power levels, that is why you often see em’ with the rear bumpers removed. I should emphasize there are more players in the game vs years ago, as far as built motors go, ugr has the most experience and most success with them, but when at the higher power levels reliability and insane power do not go hand in hand.