If you're lookin for a performance head for the 235, sometimes the old Fisher and Wayne crossflow heads do pop up. I have seen them in Hemming's, and I do seem to recall that the Fisher head was being reproduced. I think that it was being done by the same guy that did the reproduction Ar-Dun heads for the Flathead ferd. That would be much easier than trying to make a smallblock head work, the machining to make the bolt pattern work would be a nightmare to do.