Carb Studs or Carb Bolts?

KOZ45 said
the intake thread holes are 7/8" deep

The thickness of the carb flange is 1/2" thick

So that is 1-3/8" total but that's max also with bottoming out the studs into the manifold and without having any threads on top for the nuts and or washers

1/2" threads into manifold (about 1.5 x dia. is recommended min. engagement)
1/16" carb gasket
1/2" carb flange
1/16" flat washer
5/16" nut thickness (I'd always use an esna nut here)
1/8" couple of threads extend above the nut
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= 1 9/16" stud OAL

You can get by with the 1 1/2" length, or buy longer ones and screw them in further, or even cut them off. (If you can't find the standard esna nuts and are using the sometimes easier to find "heavy" ones, adjust the stud length accordingly).

Use the esna nuts, that way they don't need a nasty lock washer, but they still won't loosen up by themselves.