I've got a 78 440 Sportsman RV and the engine wiring harness is shot from the electronic module (been through 3 of them) to the alternator, coil, etc.
Online I've found harness parts but no indication (pictures) of a full harness or what I'd be ordering is a full harness or even the right harness.

So I figure I got two options:
1) Possibly you folks can give me a link to the real deal.
OR
2) I'm willing to go to a new electronic ignition. If so, how much of the old harness will I not get to rip out and end up re-wiring?

 

It's not that involved. You can make your own wiring harness for the ign. Your ign module is probably still good. Alternator is easy too..
Or look for a 1 T truck of similar vintage for a harness.
The usual problem is with the pickup in the distributor goes bad....

 

Never thought of the distributor pickup. It backfires like crazy, has zip for power, and I'm sure the pushrods and rocker arms, i.e. the engine, is ok. Would be worthwhile to visit the salvage yard for a harness in better shape and distributor parts.

Also, I found this about HEI rewiring (half way down the page). http://www.allpar.com/fix/electronic-ignition.html
Method for vehicles that originally came with electronic ignition (by Dan Stern)

And how to wire it.
http://duster318.freeservers.com/tech/hei.html