Oscar
Drill a hole feed the wires through and connect the spades on the back of the fuse holder.
And have the new holder sit above in the spot.
Alex is right a day with an experienced person and you will learn heaps.
The car has had someone at it
That can be very difficult to figure what work was done to fix it compared to what work was done in an attempt to fix it and has not worked.
Assume there has been an incorrect loom installed and specifically around the injector system.
This also could have taken out the fuel pump relay