As of this month, March 2014, Monoposto has posted revised vintage FV rules.
The most significant change being the change of the car design cutoff date being 1975.
There are a few other changes as well.
For details, please see http://monoposto.com/pdf%20Files/Rul...h_revision.pdf
If that link does not work, goto monoposto.com and through the "Rules" tab, you can find the FV rules.