Shake-xrturbo

Hey guys I was wondering how do I tell if the block and head in my BA XR6 Turbo are the original ones for my car that came from factory e.g numbers matching

Hi guys. I am wanting to put an aftermarket fuel pressure reg on my BA XR6 turbo and was wondering if the stock one comes out and generally just after some info from anyone that may have done it before. Thanks 👍🏼