Things you Find

Well the Matts agree completely on this one!
A new engine harness would be a good way to approach this.
I got away with using my 67 Barracuda's original /6 harness with the small block v-8 for a number of years.
Then I bought an engine harness from Year One.
Keep your original if you do so.

Is your Barracuda a RHD or LHD model?

LHD still, and yes 68 Barracuda....new harness would probably make sense but it appears I wouldnt be using most of it anyway, dont need any of the alternator wiring, nor the water temp switch, the oil pressure switch , the distributor/coil wiring, thats all covered with the MSD, gauges all Autometer...Im tipping the voltage reg is unused too now...Ill have to look at the wiring diagram to see if the wiring for that needs to be a complete "circuit" ... the One Wire fom the alternator was straight to the battery, soon to be to the starter motor pole, so I wont be using the alternator wire through the bulkhead, also the fusible link joins to that spade connector also in the photo that I think goes back to the starter relay, Ill test that in the morning...if this is the case, wouldnt that be the power feed to the back of the dash?

And Michael...the 360 is a retro fit, mine was originally a slant 6 car, with a V8 factory harness added it seems