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).
well im glad you know that you cant run a v8 on the stock pcm lol. but i have done more 5.0 swaps into things people said i shouldnt, making the guages work isnt hard, its just a wiring thing, thats all. but im done argueing with you about this. (i've been trying to end argueing fo three posts now) lol good luck man