Unless you want to spend a LOT of time under the hood tuning it and changing the plugs (like after every time you run it), stay away from the 426s. I never saw one yet that wasn't REAL touchy. 440 Magnum is the way to go for brute power -- plus, they take an incredible amount of abuse with, at best, indifferent maintenance.

As I've said before, back in the '70s on the street, Hemis weren't that highly regarded. That's why I'm kinda amazed about the mythology that now surrounds them.