OK, all straightened out. Heads are C6AE-R, and the Rods are C7AE-R. I know both are from 66 and 67 Gals, but could someone tell me what the -R heads are and the -R rods are from? And coincidentally, are these magical part number books still available in repro? I have a repro 64 Gal manual but doesn't tell me squat about anything but 64 parts. Is there some universal part number deciphering Ford book out there you guys use? Thanks for all the Help, its much appreciated!