91_gt5.0

hi i got a 91 gt mustang mainly stock except e303 cam msd and exhaust was wondering about how much boost it would hold on a supercharger, wat parts i would need that dont come in a kit and which kit most of yall would perfer..

http://www.vortechsuperchargers.com/product.php?p=83
this is the kit im going to get the its between the 3500 of 2500 kit ..just wanted to know what size maf i need and wats the best injector size...