Lots of people think Chrysler invented the Hemi but not so. I think his name was Ricardo or something like that in England. You could buy hemi head conversions for the Model T, Model A and most have probably heard or the Ardun conversions for the Ford V-8 flathead. All are Hemi design. Lots of current 4 cylinders use it. Chrysler just happened to trade mark the Hemi name so nobody can say anything, lol. You can just get a bigger valve in a smaller area and more flow.
The SOHC was so short lived I have the parts books from our local Ford dealer that supplied NASCAR racers and I seem to recall they were a little over $2,000 new.
Fred Millar a tool & die shop owner had one for years and finally sold it when prices went up.
Did you know they made a tunnel port 289 for a short time before the Boss 302 came out? Been looking for one but only found 15 rockers for one, lol.
Great memories.
David