there is a very close replica of the original Le Monstre in England, on the race tracks! David photographed it at the Silverstone GP circuit, – they say that the roll hoop is slightly thicker and higher, and the seats and harnesses are a little more substantial. Apparently it does have the period-correct 331ci Cadillac engine with five carburetors.

Thank you David! 

photos of the original are found at https://drivetribe.com/p/cadillac-le-monstre-the-monster-c7JrMri3SbKOYqmYV00JFA?iid=FHDMjzbrQvKE_IhN9N6Cyg