I checked the vacuum and the results are interesting. Manifold vacuum at idle is around 17"Hg or about 450mm Hg. That seems to indicate proper operation. The carburetor is a solex 28IBT. The port that would connect to the distributor has 0 vacuum at idle. The vacuum on that port increases with engine speed. That leaves me a bit confused when looking at the vacuum advance curves for the Dauphine. Are the curves based on manifold vacuum and not on the actual port from the carburetor??