Six pack power valve....

OK Experts. @brian6pac
I once again need some input from you guys.
I have a six pack on my car and like most, I said most, NOT ALL these six packs are a pain lol my question is.
Will it hurt my car, make no difference or help me...
If I swap the 6.5. pv to a 3.5 pv because I was told the reason the car does not idle properly, ( it used to before we played with it and all of a sudden it doesn't) is because the cam takes a lot of the vacuum (cam is 540 lift mechanical cam)
I don't know what to do with that issue now.
Thanks.