"cam back" (don't know if that's good car lingo or not)

Very nearly...

It is actually Kamm Back or Kammback.

The reference is to German aerodynamicist Wunibald Kamm, who in the 1930s and '40s developed the concept of the short, upswept tail on a car as a means of increasing stability and reducing drag. Do a Google search for Wunibald Kamm and you'll get about 100 hits referring to designs using his theories, although not a lot of information about Kamm himself.

tanstaafl.