Here's the reply from Eric Brumenil who ran both 3069 and 3009 in the Mille Miglia:
Hi Bill
Normally only the Bolide model can participate to the MM
but one time a Deluxe made it
There is no restriction except that the limit is 1957
Hope this helps
Kind regards
Eric

That is a great help. I have also made an inquiry directly to the MM organization for their input. But according to other sources a 56 and a 57 have run in the event.

I will keep updating this info as I get it. But I think it is finally safe to say that yes - an Arnolt Bristol Boldie can race in the Mille Miglia.

And yes Geoff - you are getting old:)

Kelly ,
Maybe I am aging a bit (I'm in the mid 60's ) but unfortunately I'm still one of the younger Bristol owners , certainly in Australia.
But I still stand by my earlier statement the 400 would be a better car to do a MM than a Arnolt.

Young Geoff