We can't say without you telling us what is villian's range for the way the hand played.

List the hands he'd play that way and you probably have a value bet on the river against non nitty villians.

No.

Depends on who's capping. If its the first Guy probably maybe yes ... the second probably not although it would be really tuff no doubt about it. I just don't think I could fold the nut str8 vs villian 2 period.