If you can, talk to Bruce Crower. He built his own crossflow head for a 1928 Nash. If I remember right, it was machined into 4 pieces. It was sandwhichedand butted together. It is a straight 8. I believe there is a Toyota engine with the same bore centers as a Ford flathead V8. More than one has looked into putting the OHC or DOHC heads on one. Good Luck

216.158 MPH 12-Port 302 GMC on 70% 171.0 MPH 302 stock head on gasoline 7 years later