Motor conversion Granada Funeral car with H-mark?

Hello dear Ford municipality! I couldn’t stand it without a nice craft car/Sunday car and bought a 1976 (MKII???) Granada funeral car. Had a 1976 GM Holden Panelvan before… and the Ford should replace this one here in Germany now… only flaw… I had a 3.3ltr 6 cylinder prepared and tuned by myself before. Now I have a 2.0ltr V6!!! And, of course, I have something going on. Now my question: of course I want a bigger moto But would like to keep the H-mark. Heisst as much as: if I can prove that it was time to drive this car with 3.0Ltr Essex engine (you already understand) then it is clear. Do I understand that correctly? What do the Ford and H-mark experts suggest, then, which engine should I install here in my case? Would like to stay with a carburetor engine because I know with eben simply. But would like to be able to get a lot of hp out of it already. all suggestions very open!!! The Essex is my favourite after my research so far but I haven’t found one to sell yet! Probably very rare… Happy me if you can give me suggestions and tips! Greetings Spooky Granada 1 Granada 2 My Holden which the Granada should replace now!!!