You might want to check with Don Little on the BB heads. The Eddy heads will take some work as they have smaller valve stem guides (need enlarged to .375") and they have seats for larger valves. I think they come unmachined, not sure if the throats are too large for stock size valves. I think the ports have too many CCs, so need the flanges need milled back. As stated, probably cheaper to find a good head guy that knows how to make them run fast. I'd figure $20k for the engine costs, maybe more.