If it smokes while your driving the car then it can be more than just the valve stem seals. IMO. Valve stem seal smoke will generally clear up some when driving, unless the guides are that loose then the shop should have never let the heads go out like that.
i agre my self i dont like thos teflon seals.they take HP away. idont use seal at all in my motor and it doset smoke at all.that sounds like an intake gasket leaking.to me i know it has hapend to me in the past.thats my thought