You are going to need retainers and locks for the new springs.
What heads are you using?
Steel billet camshafts are going to require the bronze gear on the intermediate shaft.
The cam button is used to keep the roller cam back in the cam tunnel. Flat tappet cams are kept in the cam tunnel by the taper ground on the cam lobes and roller cam lobes are ground parallel with the cam.
Get a good, stiff timing cover for the cam button, like this AREngineering one...........
BB Timing Chain Cover | AR Engineering