You must be kidding me???

I'm going to take the other side on this.
I sell Slant Six parts all the time...and I don't gouge. I generally tell the buyer "Send over whatever you think is fair".
That said, every single scrap of that thing has value, and without stretching things one bit, and only going by what I see in that pic, I could probably double my money in a month.
Typical prices....
A/C brackets and pulleys $60-75
P/S Pump and brackets $60
Early Valve Cover $40
Oil pan $40
Exhaust Manifold $50
Dipstick and Tube $25
Drool Tube Set $30
Dust Cover $25
Head $100
Block $100
Crank $100
Pistons/Rods $20 each
904 Core $150...a bunch more broken down into parts
Washer Set $20
Damper $30
Carb Core $40
...there are a ton of misc. trinkets that I can list all day...and that I sell every day.
There are people all.over the world that are beginning to collect and restore basic cars. I sell a lot of parts to guys who are de-hot rodding their cars..returning everything to original, and this stuff has a great value to them