The 5.7L Hemi used in billions of vehicles is basically the bore of a 318 with the stroke of a 360. So there's one example of a good running engine that has a 3.91 bore...
The 5.7 has heads that flow more stock than most ported aftermarket SB heads and have the stroke to help take advantage of it. Plus, the advantage of years of advancing technology in engine design. There is a reason why you see so many LS swaps now instead of small block chevys, they are easier to make good power with.
