Has anyone ever taken a chevy 6 head gasket and compared it to some of the european performance 6's like the Jaguar, Ferarri or Mercedes etc.? It might be easier than fabricating a head. I've seen Porsche V8 and subaru 4 heads adapted to SBC's because the bore spacing matched and they both showed some promise in the performance area. Just need to find someone who woks in an auto parts store?