What do you recommend? Trunk Battery, like to put a inline fuse. what size?

Are you using a cutoff switch? I don't like having the starter cable hot except when starting the engine.

I would run starter off a ford relay. Run a second 4-6ga cable forward and fuse that line for the amp loads the car is expected to use. Any high amp draw systems that are typically on when engine is running, draw right off the alternator charge stud.

Running a cutoff the above schematic works well. Fuse the line running to the starter relay.