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.
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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.