Just veniting, modular fords 4.6?

Ok heres the 5.0 bigger heads huge box intake. A couple of bolt-ons and bam 350hp ive got a 96gt with a 2v romeo so now I want to build it a bit more than it is. ok, lets buy an intake manifold I cant what about heads nope if I want heads I have to buy ported pi heads for a 99 that are crazy expensive from patriot mount it to mine than buy some more parts and manifold just to crank a little more power. Man its a powerful engine for what it is but finding parts for this 94-98 is impossible any advice on stuff you guys found or tricks thanks