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In my cuda i installed the ecu in the engine bay. I used kwik wire to re-wire my cuda and im going to use it to rewire my 68 charger also. It shouldn't be hard to wire the original key style
Honestly its not hard. Blake at diyhemi did all the hard work by labeling all the wiring and telling exactly what each wire does. What i didn't know was that the c1 connector/black connector u have to have wire 11/12 tied together in order for the engine to run. Shelbydog channel helped me on this.
Gen 3 hemi swap are pretty easy to do. The wiring is not hard to do if you got the wiring diagram. It would be cheaper to get ur original engine running tho.
My 69 mustang has fuel injection and my 74 cuda turnt into a 71 cuda clone has a 5.7 hemi in it. My 68 charger is still carb because most people didn't want me to do another fuel injection swap. Honestly i just suck with carbs so i go the fuel injection route. Easier for me plus better mpg. I...