In the '60s, Dodge built a "Hyper Six" in a 170cid, and a 225cid versions. The 170 wasn't any slower than the 225. They both used the same head, manifolds, and cam. The 225 had a higher HP rating, but didn't perform any better as the 170 revved like crazy, and you'd use a much shorter gear ratio. I just completed a 1500+ mile trip with 80-85 cars in the '08 Rods of Idaho and Oregon Cruise. There was a Dart wagon with a 170, built, that was getting 26mpg, and it was really quick, and a nasty yowl at WOT.
If it works in a Mopar, why not an AMC?
