k.. So it was my bad. I interpretted your post as you were thinking of choving river if a club, 8, or 3 doesn't not come, as a bluff. Which obviously make no sense. I see now you meant overbet if the river is 8d, 8h, 8s, 3s, 3d, 3h.. I was just misinterpreting what you were saying...

And yes, it's a pretty sexy overbet if we hit our backdoor straight as villain could interpret it as loads of bluffs and our range is polarized with a very small value range.