Wow, thats a sharp looking dash! Stereo aint bad either! I had 10's in my first '65 back there back in '85. The first owner had put what I remembered as a wood laminate flooring material in the back cargo area. It didnt look half bad but would probably be frowned on today. That and an old school Pyramid 200W 2 channel amp with some cheap soft dome tweaters in the corners...the lead into "Hot for Teacher" sounded like a Harley next to me!
Looks good, you should clean up the amp wires a bit though, unless you already did.
I was an installer for years when I was a younger chap! Run the Power and ground wires away from the speaker wires and the RCA Cables when you do it. Less chance of interference that way.
People are always complaining about cutting up a dash to put a DIN style stereo in there. I think that looks very clean. Bet it sounds good too with that big amp!
I like how you don't see the back of the speakers. Did you build a box to cover the back? My 67 cuda just has 3/4" plywood for the back hatch divider and if I installed speakers they would show.