Mark,
As you may know, there were a good number of so-called "H-mod" racers and some larger specials (frequently Devins) that looked similar to your car. I race with several Devins that appear as scaled-up versions of you car.
You might want to contact Cliff Reuter at
~Etceterini~. He may have some ideas about your car.
A friend of mine ownes and races this ALFA-powered "Ermini", which somewhat reminds me of your car.