gasket for pattern
Yep, here in Iowa, we can get all that stuff at local parts stores, course may have to wait a day or two to get it.
Failing all else, on your template for your adaptor, how about turning the carb upside down, and using paper, trace out the ports and flange pattern onto it, with the old rub the pencil lead over all the edges routine, then do the same with your intake base? and superimpose the two onto one another?
Once you have your basic outlines, you can then clean up the rough edges of your tracings and can transfer them to a stiffer medium like cereal box carboard, for your template.
I know thats old school tech but it still works pretty well.