36's or 42's

which size injectors should i go with? i have a stock bottom end. kenn bell supercharger with 8lbs of boost and i am adding trick flow heads and an f cam. i'm thinking the 42's will give me drivability problem when not in the boost, but will the 36's be enough without an fmu. any help is greatly appreaciated. thanks.
 
you could go with 42's but ive seen people on 32's with that msd fuel boost thing. i forgot exactly what its called. but it basically increases fuel delivery nd fuel pressure. looks like a mini ignition box.