possibly...but at what rpms? I'm thinking 'any' 318/340/360 manifold likely flows equally enough up to ~4000 rpm to be 'moot' from a performance standpoint, and I've also read they are likely better flowing in the higher rpms...but not by a lot, plus my engine won't be in the higher rpms enough for any flow benefits to be worth the plumbing hassle, so in my case 'better flowing' doesn't always equal 'better'...?