it will be fine with a k/n, depending on the year stang it could have either a mass air or a map sensor.your injectors are fine until u really start putting money into it.i had a 89,with a 306,kieth black 10 1/2 pistons,X cam,stock intake and fuel system and it ran like afucking champ,it was really a sleeper.stock intake hollowed out two chambers from the top,fake cats,and oh forgot about the 4.56's in the rear.god i loved that car,made alot of $$ with it