While i was in MKB we also spoke about my armoured Hammer. They told me that they are familiar with the car and believes it could be one of the very first examples built, although they cannot say that with certainty yet. He said he will check some old archives, including records related to the armoring work and which company may have done it, and he will also try to verify whether the car originally had a 4-valve head or a 2-valve head.
He even explained how I can do an initial check myself about the engine once the valve cover is removed, by looking for markings on the camshaft. He also said that even if there are no markings on the camshaft, that would not be unusual at all. Back in that period, the priority was getting the job done, not documenting every small detail the way people would expect today. If there are no visible markings, then when they rebuild the engine, they will measure the cam profile, and from that they should be able to determine exactly what specification it is.
According to him, there is a strong probability that the engine is a 5.6 version with a 2-valve setup, primarily for reliability reasons, as an armoured car had to be dependable and always ready for use, and partly because it has a 300 km/h speedometer. But again, back then everything was bespoke, so the best thing to do is to dig through the archives and see if at least some information can still be found. If it turns out to be a 2-valve setup, then it is most likely their upgraded and tuned version with around 320 horsepower because it has no cats.
However, he also said that because this was obviously a very expensive car when new, especially considering the armoring and the V8 conversion, it is quite possible that it may originally have had the 4-valve head as well. His point was that with so much money already invested in the car, it would not have been illogical for the original owner to spend even more on the 4-valve conversion, despite how expensive that was at the time. But for now, it is impossible to say with certainty. For me, all of this is very interesting and exciting, and I really cannot wait to find out what the original configuration was in the end.
He also explained something important about the early 4-valve heads. According to him, the issue was not really “cracking” in the simple way people often describe it, but rather casting-related imperfections or internal passages that could expand over time due to the way the heads were produced — at least that is how I understood his explanation.
Also, an interesting detail is the way they modified the firewall on the Hammers. He said that a small cut and a 10 kg hammer did the job.

Maybe that is where the reporter first got the Hammer name from.
So overall, his view was that the car needs to be properly checked up and inspected before any final conclusion can be made. He believes the archives may provide some answers, but the mechanical inspection will be just as important. Only once both are compared will it be possible to say with real confidence what the car originally was. For now, it seems to me that there is a high probability the car originally had a tuned 5.6L 2-valve setup.
I will definitely keep updating this thread with the progress of the restoration, as well as with any information that comes out of the archives.