I've heard of a lot of people using Ford Motorcraft 2100 carbs, but not GM carbs. Could work, but might not be optimal. The CFM rating for the Holley 2300 on a 304/345 is around 375, which is below what most 350's would use.
I have a modern Holley 2300 (center float) on one of my Scouts and I did all the mods to it similar to the 4-bbl truck avenger version. It works great.