Attached Link: Sharby's Mask Prop

It's very difficult to make that kind of morph of M3's head, because he's got so many polys. I think it would be easier to use a mask prop instead. (See link.) You'll probably have to make M3's head invisible. If you search Free Stuff on "spidey," you'll find a body texture to go with the mask. It's for M2, but you could use the M3-to-M2 version of M3. Or run it through the UTC, if you have it.