As I understand it Cooper Racing Cars closed their doors in 1969 and for various reasons in those last 2 or 3 years cars were made with Ferrari, Maserati and BRM engines. There was even an early F5000 car.
However I have no recollection, and indeed reading Mike Lawrence's book COOPER there is no mention anywhere of a Cooper Grand Prix car taking part in any F1 races fitted with an Alfa Romeo engine.
Looking at the photo I took below the Alfa engine in this car looks modern, it looks die cast , and looks very much like a production based V8 engine as fitted to the Alfa Romeo Montreal road car which was a 2.5 litre V8 on sale between 1970 and 1975.

So what exactly is the story here?
Am I right in thinking to take part in current historic races the configuration make, model, type and powertrain had to have raced in period to be eligible ?
Anyone got a GP race record of this car ? Maybe I am wrong am I ?
Vast amounts of information here about the Montreal and its engine on this excellent website
http://www.alfamontreal.info/