Please Help identifying underhood components

Well, I will admit that I'm really new to this and now thoroughly confused. I've gone down a big rabbit hole now trying to find articles and discussion on 1976 wiring. From what I can ascertain, and please correct me if I'm wrong, the '76 wiring is actually an upgrade from previous cars? I don't think fusible links are a bad thing to incorporate and the 50 amp stock alternator is good (it seems these big alternators are sought after on the older model cars).

Overall, I will keep trying to learn and do my research.

So will upgrading the headlights with a relay kit on a '76 really help take a load off my electrical system? How beneficial would it be? I did read a discussion about the slight difference in wiring and fusible links incorporated.

Why would Chrysler change out the wiring which worked so long for them on previous cars?
Headlight relay kit, see crackedback