check out
http://www.neishlinmotors.com/
clip is not just an engine. it is basically the part of the car with the engine chopped off... on an mr2, the back half of the car... on most other cars, the front half. you wouldn't put the whole clip on (ie, weld on the body pieces). you'd have to transplant the engine. it's just much easier to chop it off and ship as opposed to removing the engine from the car.