www.460ford.com might have some info. Being these blocks are still being cast I'd imagine Ford has most of the blueprints. I know there is a Ford library of some kind where you can go and copy old documents and blueprints of some things. I forget the exact details on that tho. Something I read years ago. If your ever up for making a inexpensive set of 427 SOHC cammer heads I'll be first in line.