The coated intake reduce air temps and help keep the engine cool. Very good to get the coated on if possible. Just make sure its coated underneath as well.
Chrome can hold heat in but the cooling system can deal with the small amount of heat the chrome may hold in. Alum valve cover do seem to pull a little more heat out of the engine. But chrome timing cover is probably not any different since they are both made of steel.
Get an aluminum radiator and any chrome will make no difference. They cool alot better than stock style radiator. Best to get a nice big one to keep your bbc as safe as possible.