Wiring Suggestion/Help

Mopar Virgin said

Don't know, and not sure a rep/tech would know if mixing them with their plug-in connectors would align across mixed years, so thought someone at FABO would have faced this and have a definitive answer/solution rather than rolling-the-dice. Already dealing with radiator issues associated to adding aftermarket AC that required a special compressor bracket that conflicts with the mechanical fan shroud that forced buy an electrical fan. Been through 4 radiator/fans trying to get a proper fit given the bracket/compressor only leave 4.5" of space. Everything is a domino effect it seems.

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Welcome to the world of hard lessons.
I would do whatever is neccessory to avoid adding an electric fan. If that means not using that A/C package, so be it.
The A/C electric draw alone is enough to deal with properly.
Adding an ECU is pretty easy, although the better option IMO is to use the distributor from the old motor unless it was a California car.
I would also use all the '68 pieces (intake etc) if there is EGR on the '74. There's no reason to torture yourselves with that stuff. The fuel milage and throttle response on my '68 was a warld apart from the '74 and '75 I had. OSAC in particular is a throttle response killer.