I second that Space Mountain will be tough, I'm 6'4 and I have trouble getting in and out of that one. I'd recommend skipping Goofy's Sky School and Gadget's Go Coaster (won't be missing much with either) and maybe tell him not to put his hands ALL the way up on the Matterhorn. I'm sure if there is any danger of him really getting hurt the CMs would let him know.

(I've never been told I'm too tall for a ride at
Disneyland, but it had happened at 6 Flags.)