I think what we're looking at may well be a kit-built Symphony (Modern cabinet). And since Bozak drivers were at this time available in both 8 and 16ohm versions, I'm assuming the guy who built the things must've prefered 8ohm. I still think with two tweeters per B-207 we end up with eight tweeters per speaker. How exactly does this work? I have no idea.
As to how they might sound, I would expect them to be pretty nice, but I have no direct experience with Symphonies, only Symphony. That is to say, I only had one. In the limited screwing around with it I did I thought it sounded good-- good enough to hang on to it for six or seven years, just in case another single turned up, which never happened. Eventually commonsense prevailed and the thing went back to the Goodwill whence it came. (I'm just now able to stand up straight again, i.e., I carted the damn thing back by myself and it's, um, you know, heavy.)
Good luck, whatever you decide.