Heck Nascar outlawed the SOHC before it was even announced and in fact before even 10 of them were built. They put one in a Galaxie stock car (note this was not a production car nor was it offered for sale) was taken to Daytona where it put out some lap times that were so fast, the mopar guys cried foul and nascar instantly outlawed it before it ever got to make another lap on ANY nascar track after that day.
After that since Ford already had several of them ordered they just went ahead and put them for sale over the counter for the drag guys to buy and use as crate motors.

OH yeah according to hot rod the block you need to find to build a killer 429/460 is the D7TE and D8TE 4 bolt main production blocks now go find one and prove to us all how your proof is wonderful.