My recommendation would be start with a better base engine.
2.0 zetec with a Cr of some where between 8:1 and 9:1 and a small turbo like the Gt25 or TD04 will give 220 at very low boost and can be very reliable. Example a copy of the focus Rs mk1 engine.
it still bolts on to a T9 but you will be pushing its limits.
even better would be an eco boost engine.