Ported 452 or Edelbrock RPM

crackedback said

Those steel shim gaskets might really screw up the sealing surface or the heads. Steel on aluminum isn't a good combo.

Copper coat isn't going to help that issue. I hope you didn't use the stuff in a tube.

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I used permatex copper spray, and I am really not sure what to think about all negatives about steel shims.
I heard from some C guys ;-) that steel shim with copper was used in Corvette engines from factory.
Also people tell me that I should check torque on head bolts after some miles in.
I guess steel ring in Felpro 1009 gasket leaves a mark in heads as well no?