Does anybody seriously want to spend a grand on rotten old tires?
They may look ok but tire manufacturers recommend replacement after 5 years.
Perhaps these are display pieces but no more than that.
This website may clarify the differences between these carburettors:
Carter Thermoquad - The Carburetor Doctor.
This information is referenced in the first link but here it is anyway:
A Carter Thermo-Quad Guide
Hope these articles help.