I suggest you look for Bob Tomlinson's Original Weber Tech Manual or
Pelican Parts.com - Haynes Carburetor Manual this right here.
You need to do a bit of reading before going any further. Thick gaskets are not the same as carb insulators. I suggest you read up on the basics, then come up with an idea for a fuel system based off of that.
FAT Performance should have also given you an idea of how to set up the carbs for this engine.