Well, your first problem was that you were working on a Chevy

It's all in fun! Sounds like you've had a couple classes. I'm unsure of the HP I don't know if it gives any. If it did, it's probably not enough to notice. But, why do we do anything to our trucks? To try and make it faster, look better, feel stronger, etc. We Sometimes hit it good, sometimes we're way off. Like I said before, To each his own.
One thing I do have to say about the TB spacer is that it did increase my mpg, and when going up long hills or quick starts, the truck is stronger! My theory is that it increased the torque. The main promotion of the poweraid is the torque.