You can use a Chevywater neck if you wish.
Other "Dress UP' Items can be rather generic while MoPar only things like valve covers can be had through most major HI-po part makers. Example Edel. MoPar performance Offenhauser Mildon, M/T - Holley.
All S/B MoPars will swap these type of parts from engine to engine.
It is the early 273 that has a bolt angle difference on the intake and a valve size issue when stepping up in size.