Hi mate,

You can get newman to spec the cams to your spec of engine really and what you are trying to gain.

Pistons and rods, order them from the states mate as it will save you loads of money mate

Not sure on comp ratio though, but headwork is always a bonus as it will help flow air better.

Exhaust manifold wise stay clear of the ebay jobs, go for one of the zetec turbo manifolds offered by jamsport, also speak to jamie about management as the gotech system is has a shit load more features than some other management that they offer

Cost wise to do it properly guess your looking at £3k before even getting a gearbox and turbo and all the extras mate.

Hth

Matt