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You don't HAVE to run higher compression with the aluminum heads, just you are able to run a bit higher compression without detonating.
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The gear is a 3.23 with a 2500 stall. That cam should be just a little larger than a stock HP cam, so I'm not sure why 10.5:1 CR is really needed?
That cam is notably bigger than a stock HP cam, and with 9.5 compression, 2500 stall and 3.23 gears, it will be soft in the bottom. Now if you had 440 cubes, 9.5 compression, 2500 stall and 3.73 gears I'd say you'd be okay with that cam. It's very easy to over cam a 383 and like I said, a lot of guys on here are having good luck with the comp xe268 in their 383's. I think a couple guys from here even have youtube videos of theirs.
 The Crower 271HDP, 222/234@.050 .486/.496 lift 112 centers comes highly recommended too...
"The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."
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