Great pics !. I love it - almost exactly like mine, exept for the colour & hupcaps... I guess that american cars are pretty rare in France - i have never seen one on my vacations anyway...
You could try the quick & dirty carb. clean :
Remove aircleaner & start engine.
Rev. the engine (not too much), and place the hand over the carb.
Vacuum should now pull the dirt out of the carb.
Remove the hand just before the engine stalls, and repeat as nessesary.