I think the conversion heads are a cool idea, just with the cost I don't think there's really reason to do them versus just buying a repro hemi block. If you figured in the cost of buying a repro hemi block + repro or reworked stock hemi heads + all the top end stuff like rockers, intake, I think you'd run up about the same cost as the conversion setup. But at least that way you'd have the proper parts and everything would fit like it should instead of having to custom engineer everything.