Factory HEMI Head!

The reason I would keep the intake on the left side, is that very high RPM Hemi's benefit from a long, curved runner. The curve helps pile the mixture to one side, and creates a swirl effect in the otherwise dead parts of the chamber. All that room could make for some very interesting intake combinations
I've measured room for a realistic 13" runner + plenum in my '64 GT, more room in a '67 & up body, how long You think You'd want runners for 8K?