Help on my '67 C-20

[firemapper]

I recently inherited a 1967 C 20 Custom Camper from my grandfather. He was the original owner and kept it pretty clean. It has some rust behind the fender where the water runs down from the hood/window. The rust has come through on the kick panels, but I think I can fix that. The truck only has 71,000 original miles and it is all original. I have a few questions that I can't find answers to:

I have been looking at different pictures and it seems many of the other trucks are higher in the front end and more level. Is there a leveling kit for the front independent suspension? Is it possible to raise the front without raising the back?

Is the wrap around rear bumper stock from the factory?

Where can I get a good estimate for it's value (for insurance, not to sell it)?

Thanks