Aluminum heads and steel shim gaskets ?

Felpro 1009, or Cometic. Engines will run with anything in there. But long term you need the right gasket or it can brinnel the head and lose sealing. Edelbrock wants 1009 because of the fire ring. Or Cometic because they are designed for it. But Cometic needs a very smooth surface on both heads and block to seal properly.