crack, pistons been changed and you have the ECU? either way, if you have the stuff necessary its a case of just mounting it all in, but to be honest Id get a valver or Willy shell to put it in as you have the wider arches etc. Brakes and suspension will deffo need to be uprated, all these things will cost, if you can get a valver with good bodywork and breaks etc but a blown engine that would be by far your easiest bet... or just buy a Willy/Valver and use as a spare engine when sh*t invariably goes wrong.