Slant six carb suggestions

I've got a 1970 Barracuda that is a factory slant six car. It did not have an engine in it when I got it. I've put a slant out of a 70 Dart in and need a carb, it's a 1 barrel. They seem quite difficult to find, was the Holley 1920 the factory carb used in 1970 ?? Also I was considering a 1 to 2 barrel adapter plate. I will probably run into kickdown linkage and accelerater connection problems. If anyone has advise I would really appreciate it.