I'd cvh turbo it with decent management

Its more pricey than youd think to get 170+ from a n/a blacktop, you could use an st170 ( which is a zetec-e still ) but i think the management is a pain in the arse so you'd have to sort a loom and management so pricey again

St150 is a proper duratec and fairly easy to get 170 ish with just bolt ons, lots of work tho

I'd go for a nice fresh new cvh turbo with decent ecu and a new loom