Gunner Asch fired this volley in
:

Id take the gasket material, lay it on the carberator..and tap it
firmly with a plastic or brass hammer..alll over the top of the
gasket.

If you were an old-school mechanic, you'd do it this way.

Coat one surface with Hi-Tack (or a gasket sealer compatible with the
job, if Hi-Tack won't work), and stick it down flat on the piece to be
gasketed. Hold (press) it flat until the Hi-tack grips and holds.

Finger-press or rub the surface to locate drafts and bolt holes. Just
indicate them with slight depressions, don't try to push them through.

Use a tiny ball-peen hammer, like a modeler's size (total head length
about 2" and weight about 3-4oz, and LIGHTLY tap on the inside edges of
any hole you wish to cut out.

As you tap, the holes will become better defined. If the hole has long
straight sides, use the flat end of the hammer for the sides, until you
approach the corners, working more and more toward the very tip of the
ball as you get into small circles or small-radius corners.

Progressively, you can cut all the way through the gasket material
without any damage to the work or the body-portion of the gasket. Fish
out pieces that go into holes with and awl or tweezers.

The gasket will be an exact fit, as if it had been die-cut.

LLoyd