Most of the cost is putting as much modern tech into it as I can. Multi-point Fuel injection with sequential injection capability, around $4600. Roller Cam, $1,000. Front Breaks, around another grand. Gear vendor, about 2k. Trans controller for 4l80e, around 1.5K if I remember right. Aluminum heads, about 2.4K. etc,etc.
I'm basically taking as modern as I can and putting it into a pre-emissions package just to see what the end results will be.