Powermaster 7018 External Regulated Alternator

I have a 1969 Plymouth Barracuda Formula S 340 4 Speed and a Holly Sniper fuel system. Currently, I have low dim headlights and some power issues probably due to the electric fuel pump robbing power. I purchased a Powermaster 7018 Externally regulated Alternator and I have a couple of questions. I also have all new wiring harnesses for the engine compartment and under the dash with the gauge panel restored with a voltmeter conversion removing the Amp meter. Lastly, Solid State Voltage Regulator

My questions are:
Can I use the stock wiring?
Do I still use the OE wiring for the voltage regulator
Do I really need to run a heavier gauge wire to the battery?
Anyone have pictures or a wiring diagram?

Thanks in advance!