Okay... Here is another brain-dead newbie question: Since it is possible to furnace-braze parts of heads together, as demonstrated by the small-block head conversions, would it be possible/desireable to saw three small blocks out of the head and and braze into place a new casting which includes longer radius port bends, individual ports, and more optimized port shapes?
For reliability and sealing, it might be better to mill out the top of the head and leave the head floor and valve seats, and just replace the ports and valve guides. It seems like such a replacement port casting would be relatively easy to develop as the casting would be open at the sides, and so not need elaborate self-supporting cores. Obviously, the new port walls could be left somewhat thicker to allow for porting without hitting the water jacket.
