I have heard of people welding in bosses inside the lifter valley to take the hemi studs, and putting a hemi head, and hemi cam in a 440. Dont know if its true, but I have heard that a few times from different people from other parts of the country. Id say it would be worth a shot if ya have a few "junk" 440 blocks laying around to test it out on. Im a decent enought cast welder that Id give it a shot. Heck you probly wouldnt really even need the extra bolts for head torque unless you were going for all out compression.

Kasey