What injectors with procharger?

[dallas2002GT]

Procharger D-1sc with 3 core sheetmetal intercooler:

Whats the difference between the use of 42lb injectors and 60lb injectors.
The reason I am asking is because I notice alot of people using 42lbs but my mechanic said I need 60lb injectors with a Aviator fuel pump.

 

[Built98GT]

I think you can tune it for either injectors.Most people i know just go with the 42's though.