Gasket matching question

Did you have at least one bolt on each end to align it while you were tracing? You've got the idea, when you do this you need to work back into the hole a bit so it's a smooth transition.

Use caution doing this as you can bust through if you take too much.

If it were me, I would put that gasket back on there with a bolt on each end to keep it aligned and use a scratch awl, if you don't have one maybe a nail sharpened to a pointier point, lol.