Normal 68 configuration, drvr side alternator, is shown by Geezer's Assembly page.
Your wire routing would be dependent upon physical routing of alt wiring from original. If its across the intake to the new location, aka, 69, then I'd leave it as routed. The least I'd do is to change out the #10 wire for #8 wire, including to the firewall. Otherwise, if you wanted to take a shorter route from the alt, then yes, run a length of #8 wire to the junction block, as a third wire.
The alt BAT wire is is factory crimped in the line from the junction block to the horn relay. From horn relay, a wire goes to the firewall for the car, and a wire to the battery junction block.
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