I'm no expert, but I'd say those examples were produced in much smaller quantities than a Chrysler 400 or 440. A couple of weeks ago I picked up a '78 B200 Sportsman Royal w/440 for free. There is an ad for a free Dodge motorhome not far from here that I won't deal with buy might be a 440. And I already have at least 5 440's, not including the one in the Charger. The 426 hemi has to compete with the 440 since they almost interchange and were used in the same applications. Wedges are a lot cheaper, that's the only reason they exist.