It's expensive. A lot of modifications have to be made to shoehorn the motor in there, then there is the fabrication of a lot of custom parts and conversion to rear wheel drive. To give you a rough idea the, the carb 302 rwd Focus kit sells for around $10,000, without the motor.
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"There's more flawless engineering in a Camry than all the berlinettas Enzo ever conjured while lying next to mistresses." - John Phillips/Car and Driver 
The swapped hatch hotness
Slow Five-Oh Rustang