Sorry to post a question that has been asked a million times, but I have just come into possession of an abandonned '73 Leyland Mini panel van with a motor in the back (not rear engined, just a motor sitting on a bit of cardboard in the back) and an empty engine bay. The engine number is
99H791P/133340. Questions: Is this likely to be the original engine, and would this be a 998cc with hardened valve seats? What does the "P" stand for? Is there a site where the engine number codes are explained? Thanks in advance GrahamL