Don't suppose you would have a part number for that would you?A long time ago, I added a 135 amp denso alt to my charger. I added a 4g wire from alt to main lug on firewall relay.
I run more modern halogen headlights, elec fans, fuel pump, efi and I haven’t had any issues.
Nice thing about the Denso i used is it’s externally regulated and bolted into the stock bracket