My 418 Build

With a 4" arm, moving the powerband down isn't really necessary. The torque on these is usually fat, flat and a mile long!

Got a friend with a Dart, runs a 408 with 3.23's, 3500 converter and it runs 11.40-50 at 120 because the 4" arm kicks it's rear. Aren't gonna do that with a 340 where I agree with your premise.

The voodooo line is a really good stick as well. Seen some really impressive output from the 60403 through 405 cams.