The gain of the higher compresion pi head/cam/ intake swap is minimal over just swapping out the entire motor. My point was that if he wants to just have a bolt on car to go with the pi swap. If he wants to run boost he would be better off swapping the entire motor over. Yes, you can run low boost on a pi swapped car with a stock shortblock, but there is significantly more risk doing that than there is running the same boost on the full PI motor.^???
A pi/NPI motor can have some good gains when done properly, and still not have too much compression for a blower later, as long as the boost and tune is good.
The bottom end on a PI motor is the same weak A$$ crap as any other mod motor save for the 03/04 Cobra and GT 500s. PI heads should be cheaper and easier to get a hold of than a completel PI motor. And PI/NPI motor > PI motor.