Bonjour Alain,
L'utilisation du distributeur de Langdon est facile et il ressemblera presque exactement a l'unite d'origine. Cependant, vous aurez peut etre besoin un fil de gros plus calibre (entre le contacteur d'ignition et le distributeur HEI). Mais meme cela est tres simple. Il a ete mentionne ici que Pertronix a eu des problemes. Personnellement, je pense que ce n'est pas bon. Trop d'entre eux cessent de fonctionner.
Ok, in English...Using the Langdon distributor is easy and it looks like the original unit. You may need to install a larger gauge wire from your ignition switch to the distributor but this is very easy. It has been mentioned here that the Pertronix has problems. Personally I think these units are not good. Too many of them cease to function. As one more comment: I have the Langdon distributor. It is a conversion of another GM distributor and parts are available. I hope my use of the French language will not upset the Academie Francaise. Maybe it will give them some humor. The last time I saw them (in 1997) two of them were smoking too much.