Yep, looks like a Holley Weber, which is a knock off by Holley of the Weber "DF" (as in DFM, DFAV, etc) series. Used in the infamous Pinto, but also a few more respected cars ('70 Cortina GT, and I believe the early English Capri 4 cylinder). And as opel_nut has pointed out, the main issue is the carb throats are reversed. Or more importantly, the "rotation" of the butterflies are reversed.
I used a 32 DFM (an aftermarket manual choke Weber) on my GT, and I had a 32/36 DFAV (from the aforementioned Cortina GT) on Myrna's GT, for many trouble-free years. I bought my DFM late one Friday night before a big road trip on Saturday morning, having been told that it was a "bolt up". Several hours (of cursing) later, I figured out the the throttle linkage can be reversed quite easily by rotating the bell crank upside down, but an "off-set" linkage pin had to be fabricated to adjust the linkage to suit the angle of the carb linkage. I just used a piece of brazing rod, replacing the stock steel pin, bent to accommodate the angle needed at the carb. I had promised a photo of the setup to a member a while ago, and I just found the old linkage yesterday, so I will see if I can get that done this weekend.
There has been some discussion (by RallyBob) here that the reversed primary throat (primary is inboard versus outboard on the Weber "DG" series and Solex) can exacerbate a lean condition in the centre cylinders inherent in the Opel CIH intake manifold. But mine ran over 50,000 (hard) miles without a problem, so it is probably as much a jetting issue as anything. Mine always ran a tad rich, but I never bothered re-jetting, since I was getting MUCH better performance than the stock Solex, and 35 mpg to boot.