MY98 and below inlet manifolds are not symetrical so you can't just flip them around, they take a *lot* of work. Your best bet would be to get MY99+ heads and MY99+ inlet manifold, 01+ would be better because then you have better injector options.
Kelford cams are probably the cheapest going around at the moment seeing as we rape the NZ$
http://www.camshaftshop.co.nz/index....-products.html
Or locally, All Star can supply Cosworth, i Think MMS can supply Wade etc. Ask around the workshops