im not talking about modifying the firewall (although the firewall would have to be modified less with the shorter length of either the Zetec or Duratec), or mounting the engine at all. im talking about actually making the engine run, using the stock PCM and wiring. it will be far, far easier to use the stock PCM and wiring harness (only modified as needed) than it will be to set up a stand alone PCM and harness. there is no way to run 8 cylinders off the stock PCM, so you would have to either go with a stand alone setup, or use a stock PCM/harness for a V8 (and getting it to talk to the gauges and work with the rest of the car would be an absolute nightmare).