[patrickt]

Just change out the needle and seat and reset your float levels. They only last about 7 to 10 years, if that. Now, you can't rely on the instructions from 50 years ago on setting floats. Gas percolates easier now and your carb probably doesn't sit level in your car. Put the float level as high as it will go, but below the sight hole, so that when you shut the car off hot, you do not see gas percolating in through the boosters and fuming up.