How does Gone with the Wind represent an ideal for Johnny?

Johnny puts his last note to Ponyboy inside his copy of Gone with the Wind. The gallantry of the Southern gentlemen in the book, who rode to their certain deaths bravely, inspires Johnny and reminds him of Dally. This allows Ponyboy to see Dally in that light, too, and to consider that his death might have been gallant. Johnny dies as a result of rescuing children from the fire in the church, so in that way he lives up to the ideal in Gone with the Wind.