For the holley 4bbl, summit, jegs... even over here, I can get them at any car part store, even if they might have to order it.
The ford carb... I dunno... there might not be any made, so you might have to find something and make it work.
But as you (and I) don't know what type carb they are, it gets hard to figure out.
If you find the carb models, I am sure someone can tell you exactly what you need, and probably where to get them