Big Block power with better heads???

What's the purpose? I'm assuming this is for fairly unlimited 275, 10.5 etc 'street' type classes? If NA, design something to make use of the Hemi 99 prostock heads, something that can take big inches on a 4.900 bore spacing. For boosted motors, the Gen 2 hemis are already the best thing going. S/F.....Ken M