LT1 Z/28

I just bought some used AS&M mids and I want to make sure I have every thing, felpro 1406 header gaskets, Mr Gasket Collector gaskets 5980, stage 8 header and collector bolts, anti seize and gasket sealer and I missing anything?

Also will these bolt up to the stock cat or will I need some kind of adaptor? I really don't want to buy a high flow i rather use the stock cat because I am out of money.

Any tips for future install would be much appreciated.

Thank you,
George