that setup is WAY easier than the later ones.
you have simple thread to seal.. it screws into the tank.. use thread pucky like gasoila..
past that.. use a good gas soaked cork or high density paper fiber gasket.
from there it's flair type line tot he carb elbow...
don't let this beat you.
it didn't beat dirt farmers in 1939.. and you should be smarter than them.. ;) you can use a computer!