ELECTRICAL GREMLINS [OVERCHARGING 440-3]

Hey! My first post here, I'm glad to be apart of such a cool community.

I recently picked up a 1972 Starcraft Starcruiser Motorhome, its powerplant is a 440-3. I'm having some interesting electrical demons.

I'm having a severe overcharge, on start it slowly climbs to 14...15....16 and beyond volts, under load its 17+

Here's what replaced:
- 2 Voltage Regulators [AutoZone VR and OEM Mopar from Summit] originally came with a WELLS VR
- New VR Connector
- New Ignition Coil
- New Ballast Resistor
- New Ignition Module
- New Distributor Cap + Rotor
- New Battery
- Came with a newer alternator [Duralast DL7014 with Dual Field Wires]
- New Alternator Belt
- Cleaned/Sanded every single ground + Sanded the back of VR to bare metal

What I've Tried:
- Disconnecting VR plug, still overcharged
- Disconnecting the Green Field Wire, still overcharged
- Disconnected the Blue Field Wire + VR , did not charge at all, stayed at 12.2-12.4
- Disconnected the Blue Field Wire, did not charge at all, stayed at 12.2-12.4
- Disconnected both Blue/Green Field Wires but left VR plugged in, did not charge at all, stayed at 12.2-12.4
- Disconnecting Blue Wire WHILE running [not the best idea but was desperate] gave me spark, quit charging after unplugged

There's probably more that I have done BUT those are the major things, I'm stuck! Any insight is great, thank you all so much.