what intake manifold are you talking about? You have everything you need there except for the lower half of your stock manifold. Also the PS relocation bracket is garbage. Dont use it. (do you have the alt spacer bracket) You can just carfully bend the line and reroute the hose.
Sparkplugs.com carries those plugs in stock, and how much boost are you going to run? If your not going more than the stock 6psi you dont want that big exhaust tube.