I meant that I agree with Larry's advice about using a six head with lump ports and the pitfalls associated with a hybrid, especially durability and money wise. But if you have already done this (and if you did it right you should be pulling something close to 400 HP @ 8000 RPM) and are ready to move on up then do not rule out something other than SBC heads for your hybrid. I've seen Chryseler W6, W7 hybrids and Ford SVO 4.5 V6 NASCAR/Busch aluminum hybrids, and also the later LS1 heads. These may be easier to fit up with better end results. Keep us updated on your final decision / progress.
