If you can afford it the surely the s2000 engine is a no brainer.
The 2.0 engine fitted to the newer mx5 is the same as a ford duratec. The mx5 they come in has a 5 speed gearbox which I believe is the same as ours asides from the bell housing which means it should fit our cars. That means a duratec is potentially a less complicated swap. 200bhp with itb's and decent exhaust. 220bhp is then a cam away.
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