With Big Z in the second unit now, I would be happy to see Doc use Troy Murphy in this game.
Plug Murphy in whenever Big Z is in the game and try to take advantage of Ilgauskas' inability to cover the perimeter + lack of quickness / mobility in the pick and roll.
However, if Big Z is in at center in a small ball lineup ... Murphy is a non-starter ... need someone who can provide some interior / help D on dribble penetration and that is most certainly not Troy Murphy.