Mass air conversion!!

Wanted to ask a couple questions again!!!
I was at the junk yard and saw a newer stang and was wondering about the mass air.
I know they do alot of the conversions with the 5.0's.
But is there any difference with or with out???
I plan on running my roller with my head as soon as i'm done porting..
I'm trying to get my hands on a puter if i can find one and wanted to know when i get it how do i know if it needs mass air or not???
This is n/a by the way can't seem to find any turbo motors around these parts..
 
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