Gonna need a local scout, I suppose that's why he posted here...
@Pro439 &
@shovelbill. Rottenchester checking in.
Same in the local boneyards here. I havent seen any 400 trucks in any kind of good shape in 15 years. Anything usable is hidden in garages, or turned into plow trucks long ago. But hey, at least they got their second life. The 800 trucks went straight to rot in their first 75k miles!
Only way to find what O.P. is looking for is a way down south, or a garage queen. That's where I found my C2500 18 months ago.