Nah, it's not $3000, it's only $1,940AUD. See www.xe.com/ucc
for a currency convertor. I would say that complete only means with valves/springs.
GT40 manifolds are different to the EL2 XR8 Explorer manifolds, GT40's flow heaps better.
I have been playing around with a virtual dyno on my computer lately, and it says that with a stock 302W, AFR165 heads, an E303 cam, Edelbrock Performer FMS Cobra or GT-40 manifold, 70mm TB will make 400bhp (300kw) at 5900 rpm.