What Model?

I'm storing a 1976 Alfa convertible for my son-in-law (sil). He would like me to sell it for him. I have no idea what model it is nor how to find out. Neither does my sil. The CA registration slip shows, "1976 ALFA, VIN AR3050218. Body Type 2D". What is a potential buyer likely to want to know and where do I look to determine that? I'm hoping to look on Kelley Blue Book for value after knowing how to properly ID the car. Thanks. Cove

Post a photo.

Guessing you are in California. Most on here are UK based, so valuation not much help. We have some U.S members who may be able to help. There is also a strong Alfa club in California.
If you can find the VIN plate on the car and post the whole number it describes the model, which is probably one of 22000 2000's sent to the States. Sorry if I've got this wrong.