’66 Fury engine bay wiring

So I bought the engine harness a few years ago,now getting ready to install after fitting the 390 stroker.
But, I am lost, there are quite a few differences between my Fury's originel wiring and the new one. Next to the connector is a grey male wire that I suppose should be inside the block? But where, as there are two empty slots Photo 1.

Then, can anyone school me on the fusible link. Mine has burnt the plastic off at some stage. I want to try and get one made up, what thickness...

'66 Fury engine bay wiring
Author: roelb