Mr Gasket 1121G with aluminum heads?

70Roadkill said

I didn’t think you were supposed to run the me. Gasket 1121 due to them leaving dimples in the heads? I have a set of eddy I’m getting ready to bolt up and a set of 1121 but they were going to be used with eq heads but I got a great deal on the eddys

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I heard they are not recommended with aluminum, but not exactly why.
I have a 2 sets of 1121's, one is in an iron-headed 318I have not run yet. Pistons were .040 down...
I bought another set to run on my 410, to bump up compression from 10.1:1, but now having doubts about running them.