Conti's current lever model is called the Classica. I assume this machine is the same. If you go to the Conti website you'll find it as well as a link to the parts catalog. The group on the Classica is the same one used on my Prestina, which dates back to 1980. Parts are readily available, at least from the Conti factory in Monaco. If you decide to go for it I'll get you the name and email address for my contact.
The group is very easy to rebuild. It comes apart in three sections, so replacing the rings, etc. is simple.
I wasn't born in Texas, but got here as fast as I could!