When push comes to shove, the 360 is only 5.88% larger than a 340, so they're essentially equal if they're both operating at a given VE. Now, the more power a package makes, the bigger that 5.88% becomes. With the same cam & upper end on both engines, the 360 will probably peak at a marginally lower RPM, but output will reflect the extra cubes. That's 23.5 free HP on a 400HP package.
