What should I do with my dad's 1969 K/10?

[Sidewinder4.9l]

Here's the story;

This was my dad's truck (He's still alive, just hasn't touched it in 18 yrs) and he wrecked it (Blacked out/Landed in a 7' deep culvert) causing the issues you see here...

The truck has a TON of memories (He'd let me steer it when we'd go into the hills, when I was little, and he pulled my parent's first mobile home, to where it sits now, with it)

And I'd love to get it running/driving again...

Here's the specs:

1969 Chevrolet k/10
307 v8/ 4spd transmission
4x4 Standard Cab/ Longbed

Here's what I'm dealing with-