Fusible link upgrade possible?

I used a 16 guage wire like in your pic and put a 30 amp fuse in it and never had a problem yet they were 35 amp alternators so mu buddy is a fork lift mechanic and said this will hold just fine without starting or melting any wires , Its worked foe 15 years with a 340 and upgraded alternator so I also put in a regulator that floats up to 85 amp
just have to watch for small cracks in 50 year old wires . like I said so far so good 30 amp fuse away