As far as the battery, any name brand will work well, but if you want an Optima, go for it. As for fusible links, what I suggest, since you have a later 280Z, is redo the fusible link to the MAXI fuse upgrade. I may have the parts you need to do it. Since I'm going to be doing a Painless harness soon and it has the MAXI fuse to protect the whole system, I might sell the parts I bought for the conversion. High quality car audio power distribution block, MAXI fuses, 4 guage high quality car audio wire, and some gold plated crimp ends to make connections to your altrenator and all. With that rewired, that'll fix a lot of problems in the future.