Contact Guzzler from Power Engineering in Middlesex, they will remap anything

I'd have thought you could get Kent or Pipercross to make up a lumpier Camshaft for you, try ringing them Then one of these fabrications places could do a better exhaust manifold? AFAIK the duratec isn;t a great deal different from the zetecs or even the early ohv engine, so throttle bodies/carburettor conversion could also be a possibility?

As for turbo'ing, by the time you spent out money getting the engine capable of running the correct CR, management etc etc it'd work out hell of a lot cheaper to do a cvh conversion as you have a 1.6 8v anyway and the bits are far easier to get hold of