The doug roe rochester book has a good chapter on the 4
gcs,their sizes and CFMs, the 4GCs even have tunable secondaries (with a locking screw-WCFBs are only tunable by adding or grinding the secondary wieghts-like an AFB)

Is the "teapot" carb like the stock Ford 4 bbl carb used on the '56 Ford 312s--looks like its guts have been pulled up and out? Some times the swappers think they have a piece of gold just because of the older carb's age .If I had the teapot carb, I think I would keep it covered with a big air cleaner so's not to scare small children.