If you don't place additional demands on your alternator, you won't pop the fusible link.
If you load your system beyond OEM spec (but within the capacity of the alternator,) you're going to pop the fusible link sooner or later, and you'll probably overstress the OEM lead as well.
Short form - if you want to take full advantage of your new, larger alternator, get a new, larger lead and a new, larger fuse (I do not advocate elimination of that fuse element in the circuit! The oldest vehicle I've worked on was made in 1956, and it had a fusible link wire in the generator output circuit. I've yet to see OEM wiring without it, and we have to assume that Engineering wins that argument with Accounting for a reason.)
@souske - hit me backchannel for your redesign - I've got something similar in mind for the refit on my 88 anyhow, and it's going to be far from the oddest project I've had cross my desk...