I have ERA 291. Built in approx. 1991. I believe they followed sequentially. They have a 289 model, but I don't know what else they make. I've called to Connecticut to order a couple of things, and maybe you could call ERA and talk to Peter Portent (don't think that's his last name, but it's close). Let him know your model #, and that you now have ownership. It's one of the better manufacturers out there. I bought mine last March, and if you want to know, Private Message me and I'll tell you about my car, and what I paid for it. Mine is pretty orginal looking; has an orginal 427 sideoiler, and all of those things add up to a good quality car. Sorry about your dad, and good luck finding your information.
Kristen
ps. there is somebody on this forum with a low number ERA, also. hmm. I'll think about who it is.... There are a lot of people here with tons of knowledge about this. They will jump on and give you lots of answers!!