Hmmmmm! I wouldn't think you would have ANY "unused wires. Possibly, since the BB has the distributor in front, the coil and distributor wires would need to be longer, or the oil pressure and temp sender might be in a different location, but they should still need the same amount of wire. The alternator, electric choke etc. (if present) should still need power. I can't really think of anything you would be able to lose.
RamchargerCentral.Com is a Dodge truck community built by a vast number of experienced owners. Whatever you're thinking about doing from routine maintenance to full-on restoration, odds are somebody around here already has. Originally focused on the Ram Charger / Trail Duster, our members own, drive and wrench on Mopars from the 40s to the current day. It's not what you buy, it's what you build.