My 2 cents. For where I live anyway.
A running driving big block truck:
Running big block with trans = easy $1000 all day long
Decent body and rolling chassis (Dana 60?) = can not be less than $500, no way.
If it drives and stops, the tires are decent, the glass is good, in other words, will pass inspection, your price of $1800 would be a good deal without painting the rims etc.
It is a running vehicle. Besides that, it is a truck, besides that, it is an early Dodge truck. A Dodge truck that doesn't have a ton of rust.
My 2 cents........
I sold the one that I posted earlier, although it was a big block 1/2 ton. I asked $3500. I got a trade. I did far better than $3500.