OK, I've been reading through a bunch of old postings on this subject, and it seems that many have run an 8AWG wire with a 12AWG fusible link from the alternator directly to the battery terminal on the starter solenoid
That works, too, but it's a longer run of more difficult-to-work-with (8ga) cable, and fuselinks are much more of a pain to service than fuses. Here's someone who wound up glad he did it the way I suggested.
I will also be adding Crackedback's headlight relay harness.