That's one thing I forgot to mention I'm currently running the normal OEM gaskets with the NeedsWings manifolds because as Steve said the old cork ones were toast! I didn't realize that could make such a difference? Surley the OEM gaskets would atleast be good enough to seal them up to around 15psi!

So what I've done since my last post is, re-tighten the manifold bolts (they got abit loose, I'll use blue thread lock after I get the cork gaskets) and now the car idles fine, however when I got WOT after 5,000rpms until redline the car just stops pulling, it almost sounds like it's revving in neutral then it changes gear and it's okay again until it gets to 5,000rpms. Im now hoping it's to do with not having cork gaskets and nothing else