Nick's Garage dyno's a 318 Stroker.
There will always be those that discount the 318. It just didn't have the glory of the 340 because it didn't receive the cams, 4bbl, good manifolds... it was a grocery-getter.
But for what the 318 will do, it's worth it. You can get cheap power from a 318. Try buying anything 340 cheaply. :D