I've been thinking about this for a while and I didnt want to cloud up EdonShanno's blown 588 thread. Its winter, I'm bored, so here we go.
For this discusion lets leave compressor efficiency & intake temps out of the equasion for the time being.
Lets use EdonShanno's blown 588 for a starting example here. He made 1100hp on pump gas at 7psi of boost. You have to get X-amount of fuel & air into that engine to accomplish this, that fuel & air is converted to a dynamic cylinder pressure to achieve the resulting 1000ftlb & 1100hp. A fuel can only stand so much dynamic compression ratio- cylinder pressure before it will detonate. Here comes the big question, you ready for it
If you were to put a very small set of heads on that same engine and crank up the boost till you had the exact same tq & hp numbers, wouldnt that indicate the same dynamic comp - cylinder pressure and wouldnt you be able to still get away with the same fuel no matter what the boost guage in the manifold ended up reading?