Kugel Komponents has been making Ford V8/Focus swap kits for a long time. Their kits enable you to run a 4.6 L or 5.0 L V8 in your Ford Focus and convert it to RWD. The full kit cost about $8,000 and includes engine cradle, transmission mounts, suspension crossmember, front steer and hub kit, sway bars, rack and pinion kit, transmission cover, fuel tank, headers, diff crossmember, 4-bar kit with shocks and springs. Of course you can purchase the parts separate if you want as well. Kugel Komponents estimate it would take someone with decent skill level about 100 to 150 hours to install everything.