[Dick Boneske]

For your engine as you listed it above, I'd open the idle bypass restrictors to .052"(from the stock .046"). Idle tubes .038"(from about .034" stock). Idle adj. screw holes in the throttle body .073"(from about .070").

As Kenth said, the idle mixture screw taper will affect how many turns from seated gives smooth idle (max. vacuum). The stubby ones would require less turns out from seated.

If three turns out still gives you adequate spring pressure, and idle is good, I'd leave it as is.