Usually people do engine swaps to gain performance, not lose it...I assume you already have the engine, and you want to use it... you will need to cut the car up and weld mounts in, change wiring, and get a custom driveshaft made. A simple swap would be for an original engine. A great engine to swap would be a jeep 4 liter engine, and the junk yards are full of them. They have seven main bearings, and are fairly bullet proof. I've seen them with half a million kms, no oil pressure, whipping doughnuts at 5500 rpm all day. Performace parts are abundant aswell.