The longer you hang out here, the more you'll learn that the info the guy gave you was a little off.
Swaps are possible, big boost is possible and CA is a state that has more than a couple shops to do it right. Start researching what is possible and fits into your plans. 50psi is not a realistic number for anything short of full-race, rebuild-per-pass monster motors. $2800 will get your foot in the door, but not a complete swap(by a reputable shop).