There is a guy out west that has built carbs for 35 years. His name is Mike Mitchell. He has a great site with a lot of instruction, carb kits, etc. His kits include parts that are obsolete in other kits. If you want to know about rebuilding a teapot search Youtube...Holley 4000 teapot rebuild. Look for the author to be Mike's Carbs. There are 6 or 7 parts showing step by step to completion. There is over an hour of free instruction. Mike's carbs is Mike Mitchell. I bet if you mailed him he would help.
http://www.carburetor-parts.com/