I'm a bit late here, but I do agree that you have a lovely machine there. A bit of work, but very well worth it.

The Stronglight crank is one of my absolute favorites, BUT it has unique threads. To remove it requires using the right tool OR you ruin it. You may need to find an older bike shop that has the proper crank puller.

As for the pedal threads, look at the back side of the crank arms. The threading should be stamped on the arms along with the length (likely 170). If they are French, as we suspect, that does not guarantee that someone hasn't tapped them to English, but it's a start.

Someone suggested 32mm tires. Be careful that they fit. That might be about the maximum or just over.

Otherwise, just a bit of patience and you have a very, very fine riding machine.

Congratulations!