As long as your engine is in good shape and you run a scanner to monitor knock you should be golden. Mine was full bolt on and I had almost 300k of hard miles on the original engine before smacking a wall. Stay up on your maintenance do thing's right, and resolve issues while minor. Do that, and the engine will last forever even with a wee bit more boost.
These engines are very solid and reliable beasts it's every other part of the car, especially the transmission. you need to be worried about with these W bodies.