I have aluminum intakes on ALL of my carbureted engines and, knock on wood, have never had an issue. One went 360,000 miles after I bought the truck and installed the aluminum intake.

I did have the issue Jerry mentioned, but with an aluminum cylinder head (about 4 inches thick, rather than the 1/2~3/4 inch thickness of the intake mounting flange).

The different expansion rates not only compressed the gasket, but stretched the head bolts.

Jon

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
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The Carburetor Shop